Why the properties of elements are repeated after 2 8 18 and 32 elements?

Answers

Answer 1

The properties of the elements are repeated after 2 8 18 and 32 elements because these are the maximum number of the electrons that the four shells contains.

The electronic configuration of the elements in the periodic table are repeated because the maximum number of the electrons that the four shells can have are 2 8 18 and 32. the name of the four shells are K , L, M, N. The electronic configuration of the elements are repeated and due to this the properties of the elements are repeated.

Thus, the properties of the elements are increases because the electronic configuration are repeated in the periodic table.

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Related Questions

A gas made up of atoms escapes through a pinhole 0.920 times as fast as Cl 2 gas. Write the chemical formula of the gas

Answers

Answer:

The gas with molar mass 83.9 g is Krypton, Kr

Explanation:

We know that as per Ghram's law of diffusion,

r'/ r= square root (M/M')

0r [tex]\frac{r'}{r } =\sqrt{\frac{M}{M'} }[/tex]

Where

r= rate of diffusion of Cl2

r'= rate of diffusion of unknown gas= 0.920r

Also, M= molar mass of Cl2= 71 g/ mol

And, M'= molar mass of unknown gas which we have to find

Let us substitute the values in above equation

[tex]\frac{0.920r}{r } =\sqrt{\frac{71}{M'} }[/tex]

solving we get M' = 83.9 g/mol

Therefore,  the gas with molar mass 83.9 g is Krypton,Kr

What causes stress in rocks? and What happens when stress is released?

Answers

When plates are pushed or pulled, the rock is subjected to stress. Stress can cause a rock to change shape or to break

C. If 71.2 grams of Beryllium Chloride is reacted with 161 grams of
Potassium Nitrate, identify the limiting and excess reactants.

Answers

Answer: rytesttrt5rtr

Explanation:

Fe(OH)3
⎯⎯→
Fe2O3
⎯⎯→
Fe
⎯⎯→
FeCl2
⎯⎯→
Fe(OH)2

Answers

Answer:

decomposition reaction

Complete this Lewis structure for S2O32− by adding lone pairs and formal charges.
Add lone-pair electrons and formal charges to this structure.

Answers

The complete lewis structure is shown in the below figure by adding lone pairs and formal charges.

Assign the valence electrons to each atom as dictated by the periodic table placing one electron at each compass direction and then pairing them only after the first four until you have place all of the atom’s valence electrons. (See the Roman numeral above the group/column it is in.)

Arrange the remaining atoms around the central atom and join them to the central atom by a single bond. The more electronegative atoms are typically farther away from the center and attaching hydrogen last is advised.

Lone electrons (not lone pairs) indicate an ability to form more covalent bonds, resulting in either double or triple bonds. Their presence or the lack of a full octet on any atom indicates there is a better Lewis structure.

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Which salt is formed by the reaction between hydrochloric acid and sodium hydroxide, write with chemical equation. .​

Answers

Answer:

salt sodium chloride (NaCl)

When 45. 8 g of alanine (C3H7NO2) are dissolved in 1200g of a certain mystery liquid X, the freezing point of the solution is 4. 10 ℃ less than the freezing point of pure X. Calculate the mass of sodium chloride that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor i=1. 82 for sodium chloride in X. Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits

Answers

16.5 g is the mass of sodium chloride that must be dissolved in the same mass of X to produce the same depression at freezing point.

What are a molar mass and a mole?

Avogadro's number (6.022 x 1023) of molecules (or formula units) make up one mole of a substance (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the number of grams per mole of a substance, to put it another way.

ΔT = Kc*W*i

Kc = cryoscopy constant of the solute X

W = molality of the solution

i = van't Hoff factor, For organic molecules, such as alanine, i = 1.

n = 45.8/89.09

n = 0.5141 mol

W = 0.5141/1.2 = 0.4284 mol/kg

So, Kc of X is:

4.10 = Kc*0.4284*1

Kc = 9.57 °C.kg/mol

So, if now sodium chloride is added to X, and the temperature change is the same, and i = 1.82:

4.10 = 9.57*W*1.82

W = 0.2354 mol/kg

The number of moles of the solute is then:

W = n/1.2

0.2354 = n/1.2

n = 0.2825 mol

The molar mass of sodium chloride is 58.44 g/mol, thus the mass is the molar mass multiplied by the number of moles:

m = 58.44*0.2825

m = 16.5 g

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What do these two changes have in common?

an engine using gasoline to power a car
cellular respiration

Select all that apply.
Both are only physical changes
Both converse mass
Both are chemical changes
Both are caused by heating

Answers

Answer: Both are only physical changes

Both converse mass

Explanation: the first two ones r correct

Glass is typically produced by mixing sand (quartz or silica, SiO_2) with other compounds or minerals, which are then crushed, melted, and then cooled (vitrification). Given the compositions and properties of the different types of glass in the table above, consider the role each compound plays in the type of glass formed, and then complete the statements below. Match the compounds in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Adding to the mixture that undergoes vitrification produces a glass with brilliant optical properties. Adding to the mixture that undergoes vitrification produces a glass that can be used for baking purposes or storing chemical solutions. Adding to the mixture that undergoes vitrification produces a glass that is insoluble in water. Adding to the mixture that undergoes vitrification allows the glass to be produced at much lower temperatures.

Answers

Addition of soda (Na₂CO₃) to the vitrifying mixture produces glasses with excellent optical properties.

Give a brief account on silica?

Silica is the common name for the compound silicon dioxide, which consists of one silicon atom and two oxygen atoms. It is an important component of many rocks, sands, and clays, and is also found in many plants and animals. Silica is used in a wide variety of products, from beer and wine to pottery, glass, and paint. It is also used in building materials such as concrete and mortar, and as a food additive. Silica is also used to make silicon-based electronics such as computer chips.

Adding lime (CaCO₃) to the vitrifying mixture creates a jar that can be used to bake or store the liquid medicine.

Addition of alumina (Al₂O₃) to a mixture undergoing vitrification produces a glass that is insoluble in water.

Addition of borax (Na₂B₄O₇) to the mixture during vitrification allows glass to be produced at much lower temperatures.

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what percent composition tell you about a molecule

Answers

Answer:

tells you by mass what percent of each element is present in a compound.

Explanation:

How can you tell by looking at the graph if a substance is solid, liquid, or gas at room temperature?

Answers

Louis Tomlinson I have to go to the park to park on the bus stop at Walgreens

Students are challenged to design cold packs for treating injuries. To do this they must find a chemical reaction that absorbs heat energy. The ideal chemical reaction will reach a temperature in the range of 0C to 4C and maintain that temperature for a minimum of 20 minutes

Answers

Students as a chemical reaction that absorbs thermal energy for the design of cold packs for the treatment of injuries can combine manganese oxide (MnO2) with hydrogen peroxide (H2O2)

By controlling the amounts of the reactants they can control the temperature, keeping it between 0 °C and 4 °C for 20 minutes or more.

This type of chemical reaction is called endothermic, because energy is absorbed in the form of light or heat, causing the resulting products to have higher energy than the reactants.

Chemical reaction that absorbs thermal energy fpr cold compresses for the treatment of injuries

The most widely used endothermic chemical reaction in the treatment of injuries is the melting of ice, at least in warm environments, which occurs according to the following reaction:

H2O (s) + Energy ----- H2O (l)

Decomposition of manganese oxide absorbs thermal energy

The effect of an endothermic reaction is absorbs heat energy and in the case of manganese oxide the following decomposition occurs:

MnO2 (s) → MnO (s) + ½ O2 (g); ∆HR = 134kJ

Students can design cold packs for treating injuries with manganese dioxide bcause it breaks down into two products, manganese oxide and oxygen, making the enthalpy greater than zero (∆HR > 0).

MnO2 is a solid between gray and black in color and is present in minerals such as pyrolusite and nsutite, when combined with hydrogen peroxide it acts as a catalyst so that it accelerates chemical reaction

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If there are 6 atoms of hydrogen on the products side, how many molecules of H2 are on the reactants side?

Answers

If there are 6 atoms of hydrogen on the products side, then there would be 6 atoms of hydrogen also on the reactants side. That would be 3 molecules of [tex]H_2[/tex].

Law of conservation of atoms

According to the law of conservation of atoms or matter, atoms can neither be destroyed nor created during the course of chemical reactions. However, atoms can change forms during reactions.

Going by this law, it means the number of atoms of a particular element must remain constant before and after chemical reactions. Otherwise, we will say the chemical equation of such reactions are not balanced.

Thus, if there are 6 atoms of hydrogen on the products side of a reaction, 6 atoms of hydrogen must also be on the reactants side of the reaction. A molecule of hydrogen, [tex]H_2[/tex], has 2 atoms of hydrogen. This means 3 molecules of hydrogen must be on the reactants side in order to have a total of 6 hydrogen atoms.

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PLEASE HELP
How many moles of silane gas (SiH4) are present in 8.68 mL
measured at 18 0C and 1.50 atm?

Answers

Answer: There are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

Explanation:

Given: Volume = 8.68 mL (1 mL = 0.001 L) = [tex]8.68 \times 10^{-3} L[/tex],    

Temperature = [tex]18^{o}C = (18 + 273) K = 291 K[/tex],

Pressure = 1.50 atm

The ideal gas formula is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\1.50 atm \times 8.68 \times 10^{-3} L = n \times 0.0821 L atm/mol K \times 291 K\\n = \frac{1.50 atm \times 8.68 \times 10^{-3} L}{0.0821 L atm/mol K \times 291 K}\\= \frac{0.01302}{23.8911}\\= 0.00054 mol[/tex]

Thus, we can conclude that there are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

According to the data, the temperature of the
substance is 28°C. If we know that 0°C = 273 K,
what is the temperature of the substance in
Kelvin?

Answers

Answer: 351

Explanation: From °C to kelvin we do

K=273+°C

From Kelvin to °C we do

°C=K-273 or -273+ K

In the 1930s a telephone-company engineer named Karl Jansky was trying to track down

Answers

Answer:

In the 1930s a telephone-company engineer named Karl Jansky was trying to track down the cause of hissing static in phone lines when he discovered something strange. Radio energy from outer space was interfering with the phone signals. After learning about Janksy's discovery, a radio engineer named Grote Reber decided to investigate.

Explanation:

Hi what's the answer to this

Answers

Explanation:

Atoms are tiny spheres that cannot be divided

How many moles of neon are in 7.6 x 10^23 in sig figs

Answers

Answer:

1.26 moles

Explanation:

Applying Avogadro's constant.

1 mole of every substance, has a particle of 6.02×10²³

From the question,

If,

1 mole of Neon contains 6.02×10²³ particles

Therefore,

x moles of Neon will contain 7.6×10²³ particles

x = (7.6×10²³)/(6.02×10²³)

x = 1.26 moles.

Hence the number of moles of Neon present is 1.26 moles

If an engineer is designing a building in an area that has an occasional

supersonic flight pass over it, the engineer should:


A. Design the building with extra stores of oxygen for the workers in

case of emergencies caused by sonic booms.

B. Build the structure using materials that are heat resistant because

of the sonic booms.


C. Design extra reinforcements in the building's windows so that they

can withstand the vibrations from sonic booms.


D. Design the building with solar panels that can provide energy in

case of electrical outages due to sonic booms.

Answers

Design extra reinforcements in the building's windows so that they can withstand the vibrations from sonic booms.

What are Sonic booms?

Sonic booms are shock waves created when an object, such as an aircraft or spacecraft, travels through the air at a speed faster than the speed of sound (approximately 767 mph). Sonic booms generate a loud noise that can be heard over long distances. Sonic booms can cause property damage and are hazardous to people's hearing.

Extra reinforcements in the building's windows can help to absorb the shock of sonic booms. This is done by adding additional layers of materials such as glass, plastic, rubber, or metal to the window frame. These materials will help to dampen the vibrations from sonic booms, reducing the noise and preventing damage to the windows. Additionally, window seals can be installed to reduce air infiltration, further helping to protect the windows from the vibrations of sonic booms.

Hence, Option C is correct.

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How many ATP are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized?

Answers

4 ATP molecules are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized

How Krebs cycle move to produce glucose molecule?

The Krebs cycle,  TCA cycle or the citric acid cycle, is a series of enzyme-catalyzed reactions occurring  in the mitochondrial matrix and involves the oxidation of acetyl-CoA.

The acetyl group of acetyl-CoA is oxidized to make two molecules of CO2 in a succession of eight steps, while also producing one ATP. Additionally, reduced high-energy molecules like NADH and FADH2 are created.

Each glucose molecule produces two acetyl-CoA molecules, the Krebs cycle must  move twice for one glucose molecule to produce the four CO2, six NADH, two FADH2, and two ATPs.

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Prior to making your first extrication cut, you must first stabilize the vehicle. What tool will you use

Answers

Cribbing is the tool we use prior to making your first extrication cut in the vehicle

Before making the first extrication cut, it is important to stabilize the vehicle to prevent it from moving and to ensure the safety of the individuals involved in the extrication process. One tool that is commonly used to stabilize a vehicle during extrication is a set of stabilizing struts, also known as cribbing. Cribbing is a set of wooden or composite blocks that are placed under the vehicle to support it and prevent it from moving. The cribbing is typically placed at strategic points, such as the frame of the vehicle or the wheels, to provide a stable base for the vehicle.Additionally, other tools like wheel chocks, jacks, and air bags may be used to provide additional support and stability. The extrication team will assess the situation and choose the most appropriate tool to stabilize the vehicle.

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In general, which of the following ranks the repulsions indicated from weakest to strongest? O Lone pair-bonding pair, lone pair-lone pair, bonding pair---bonding pair O Bonding pair-bonding pair, lone pair-bonding pair, lone pair-one pair O Lone pair-lone pair, lone pair-bonding pair, bonding pair-bonding pair O Lone pair-bonding pair, bonding pair-bonding pair, lone pair-one pair

Answers

Option B, Bonding pair-bonding pair, lone pair-bonding pair, lone pair-lone pair. The electrons in bonding pairs are repulsion held relatively closely together, and are involved in the formation of a chemical bond.

The repulsion between two bonding pairs is relatively weak, as they are attracted to the positively charged nuclei of the atoms they are bonding. The repulsion between a lone pair of electrons and a bonding pair of electrons is generally stronger than that between two bonding pairs because the lone pair is not involved in bonding and tends to be held further away from the nucleus, causing the electron cloud to be larger and thus a stronger repulsion because the two lone pairs are not involved in bonding, and are held relatively far away from the nuclei, causing the electron clouds to be larger and thus a stronger repulsion

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Jordan places a hot spoon into a container of ice cream. How does this help him scoop out the ice cream?


1 The coolness from the ice cream is conducted to the spoon making it easier to scoop out.

2 The warmth of the spoon is conducted to the ice cream making it easier to scoop out.

3 The coolness from the ice cream is radiated to the spoon making it easier to scoop out.

4 The warmth of the spoon is radiated to the ice cream making it easier to scoop out.

Answers

Answer:

Option 2:

The warmth of the spoon is conducted to the ice cream making it easier to scoop out.

Explanation:

Conduction refers to the transfer of heat from a hotter body to a cooler one, by virtue of physical contact between the two bodies. This is opposed to radiation, where there does not need to be any contact between the two bodies before heat con flow.

The warm spoon, once it has physical contact with the cool ice cream, it loses some of its heat to the ice cream, warming it up, making it easier to scoop up.

write two ionic equation to show that aluminium hydroxide is amphoteric​

Answers

Answer:

Explanation:

Aluminium hydroxide is amphoteric. 3 HCl + Al(OH)3 → AlCl3 + 3 H2O. In bases, it acts a Lewis acid by taking an electron pair from the hydroxide ions: Al(OH)3 + OH− → Al(OH)

The faster the object is moving the more portential energy it has?

Answers

Answer:

sure

Explanation:

Calculate the mass, in grams, of 0.965 mol of sodium hydroxide
(NaOH), in a drain cleaning solution.​

Answers

Answer:

38.51g NaOH

Explanation:

NaOH=39.907 g/mol

0.965 mol NaOH X 39.90g NaoH/1 mol NaOH= 38.51 g NaOH

What observation is made when magnesium powder and lead(ii) are heated together​

Answers

Answer:

in the lead strip the will be no change and no reaction. this is job salvation that is made when magnesium powder and lead to our heater together

can u help me please​

Answers

Answer:

weak

Explanation:

this is my best guess

How many energy levels/electron shells does beryllium have?

Answers

Maybe for sure its element number as five and two in for as Number of electrons in each level?  

Beryllium has 4 electron shells.

Hope this helps

Suppose that 13g of a nonelectrolyte is dissolved in 0.50 kg of benzene. The
boiling point of this solution is 80.61 °C. The normal boiling point of benzene is
80.10 °C. The molal boiling point elevation constant for benzene is 2.53 °C/m. What is the
molar mass of the solute?

Answers

Answer:

128.98 g/Mol

Explanation:

ΔTb = Kb * m * i

Where;

ΔTb = boiling point elevation

Kb = boiling point constant

m = molality of the solution

i = Van't Hoff factor

Hence;

Where molality = number of moles of solute/mass of solvent in Kg

Number of moles of solute = mass/Molar mass

So;

80.61 - 80.10 = 2.53 * 13g/M/0.5 * 1

Where M is the molar mass of the solute

0.51 = 2.53 * 13g/M/0.5

0.51 = 2.53 * 13/M * 1/0.5

0.51 = 32.89/M * 1/0.5

0.51 * 0.5 = 32.89/M

0.255 M = 32.89

M = 32.89/0.255

M= 128.98 g/Mol

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What information should always be included in the introductory paragraph of a research report? A. A thesis statement identifying your main points. B. The point of view you plan to use.C. The main sources used for research.D. The reason why you selected the topic you did . Which word is silent in POWER ? Write the quadratic equation whose roots are 5 and 6 and whose leading coefficient is 5(Use the letter x to represent the variable.) The orange shape is a dilation of the black shape. What is the scale factor of the dilation?Simplify your answer and write it as a fraction or whole number. Which of the following statements regarding non periodic distributions from an annuity contract prior to the annuity start date, issued after August 13, 1982, is true ?A) A nonperiodic distribution is prorated equally between a tax-free return of principal and a taxable interest payment.B) A nonperiodic distribution is taxed under the exclusion ratio rules.C) A nonperiodic distribution is taxed first as a taxable interest payment until the interest payments are completely exhausted, and then as a tax-free return of principal.D) A nonperiodic distribution is first considered a tax-free return of principal and then a taxable interest payment. A) 12B) 7C) -11D) 86x+4 What is the target of a satire? 3. What job did Meip and Mr. Kraler do for theFrank family?(1 Point)O They bring food, supplies, and news.They try to help them escape Holland.o They buy Mr. Frank's spice business.The give ration books to the poor. PLEASE HELPConsider the two circles shownTo show that circle P is similar to circle Q, circle P is translated t units to the right. The image is then dilated about its center by a scale factor of s.What are the values of t and s 4x 2y = 1 3 and 4x + 4y = 2 what does x and y equal? 6) What is the value of digit 7 in 0.057 *.///what is the answer _____________________7/10 0.077/1000 who is a polyvalent nurse Which of the following was not a cause of the Great Depression?Group of answer choicesWWIBanks closingOverproduction of goodsHigh unemployment Simplify 32q^9r^4 / 4q^3r If you know the answer to this question please help!! ASAP Convert the angle to radians. Leave as a multiple of Pi. 810 degrees A car goes into a skid and comes to a gradual stop, accelerating at a constant rate to do so. At the midpoint of the skid, how much of its kinetic energy has the car lost (as a percentage, give % as the units)? 4. What foreign dictator is most associated with exiling the children of Israel in the 6th century BC Harprr buys a flannel sheet online for 22.50.If shipping and handling are an additional 35% of the price,how much shipping and handling will haper pay What is the volume of 2.43 x 1023 molecules of N2 gas at STP