2. Which of the following is the reason that ionization energy generally increases from left to right across the first period of the periodic table?

(A) As the atomic number increases, the electrons are harder to remove.

(B) Ionization energy increases as the atomic number increases in a period.

(C) As the atomic number increases, more electrons are
added to the atoms, thus increasing the electron-electron repulsions.

(D) As the atomic number increases, more protons in the
nucleus cause an increase in the effective nuclear charge,
making it harder to remove the electrons.

Answer:

Primary pollutants can be emitted from many sources including cars, coal-fired power plants, natural gas power plants, biomass burning, natural forest fires, volcanoes, and many more. The effects of primary pollutants are of concern as they can be harmful to humans, animals and plants.Sep 3, 2018

Explanation:

A primary source results from the direct emissions from an air pollution source. In contrast, a secondary source results from the formation of a pollutant in the atmosphere from the chemical reaction of precursors emitted from air pollution sources.

Answer:

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Answer:

yes because my class went over sum like that

Explanation:

there are 6 orbitals are formed when six p- orbitals of benzene combine.

Salt lowers the freezing point of water by interfering with the intermolecular forces of the water molecules, allowing for less interactions between water molecules.

The Freezing point is the temperature of a liquid at which it changes its state from liquid to solid at atmospheric pressure.

Salt molecules block water molecules from packing together when temperature is lowered. It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase. Freezing point depression occurs when the freezing point of the liquid is lowered by addition of solute.

Hence, option B is correct.

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Answer:

Its separates the components of heterogeneous mixtures.

like examples :-

The chemical formula for peracetic acid is C2H4O3. This means that there are 2 atoms of carbon, 4 atoms of hydrogen, and 3 atoms of oxygen in a single molecule.

I think that the answer is C2H4O3.

Answer:

A salt that is dissolved in water is called a solute

Once you have dissolved the salt - you have a solution

The water is called the solvent

Explanation:

We have that When salt dissolves completely into water the water is called a Solvent

it is important to not that once the salt compound comes into water it breaks down the molecule apart the Na on one hand and the Cl on the other hand

Once the NaCl is dissolved in to the H_2O it is known as a solute of salt

And when When salt dissolves completely into water the water is called a Solvent

Therefore

When salt dissolves completely into water the water is called a Solvent

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Answer:

B. inferring

Explanation:

Answer:

This is true. A hot glass does look the same as a cold glass. Glass won't change its look if it's below 648 degrees Celsius.

Answer:  MgCl2

Explanation:

Convert the masses of Mg and Cl to moles:

Mg:  1.2g/24g/mole = 0.050 moles

Cl:    3.55g/35.5g/mole = 0.100 moles

The ratio of Cl to Mg is 2 to 1:  (0.100 moles Cl/0.050 moles Mg),  Therefore there must be 2 Cl for every Mg:

MgCl2

This is the empirical formula since all we know is the ratio.  If could also be Mg2Cl4, Mg3Cl6, etc,  [i.e., (MgCl2)n]

no, the box would not accelerate

Answer:

Reha should apply 540 N to lift Neha.

Explanation:

L = 360 N

LD  = 60 m

E =?

ED = 40m

NOW

L * LD = E * ED

360 *60 = E*40

21600/40 = E

540 N = E

Answer:

a no. because tearing the raw meat will not be easy without the use of the canine teeth

Answer:

To find the formula of an ionic compound, first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge. Finally, combine the two ions to form an electrically neutral compound.

Explanation:

Answer:  The question is difficult to read.  Please add numbered lines and check before uploading the question.  I copied and organized the best I could, followed with my answers, below.

Explanation:

1. an element with a high electronegativity and an element with a single valence electron YES

2. an element with a high electronegativity and an element with a single valence electron Duplicate

3. an element with a high electronegativity and an element with a full shell of electrons NO

4. an element with a high electronegativity and an element with a full shell of electrons Duplicate

5. an element with a high electronegativity and an element with low reactivity NO

6. an element with a high electronegativity and an element with low reactivity Duplicate

7. an element with a high electronegativity and a second element with a high electronegativity NO

Elements have electronegativities because of the tendency of attracting electrons. An element with a single valence electron and high electronegativity will react with each other. Thus, option A is correct.

Electronegativity has been defined by the atom's tendency to attract the electrons that are in sharing for the formation of the chemical bond. The atomic number and the atomic radii affect electronegativity.

High electronegative elements are electron acceptors and are characterized by an almost full valence shell. The electron is required by them to achieve stability and complete octet. Elements with full shells cannot accept more electrons.

Therefore, option A. high electronegative element reacts easily with a valence electron to form a bond.

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what is the chemical formula of ( methane ) ??

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Answer:

[tex]CH_4[/tex]

Explanation:

Methane is a chemical compound with the formula CH4. ( One atom of carbon and four atoms of hydrogen).

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Answer:

physical quantity is used for measuring mass.

have a great day God bless you

Explanation:

1 significant figure and 0 decimal

Answer

b.

Explanation:

variable means change bro

Answer:

These are the answers for the Atomic Number Quick Check

Explanation:

1. An element is highly conductive, highly reactive, soft, and lustrous. The element most likely belongs to which group?: alkali metals

2. How does mercury differ from other metals?: It is not solid under normal conditions.

3. Based on patterns in the periodic table, which element is the least malleable in its solid state?: phosphorus (P)

4. In which group of elements does tellurium (Te) belong?: metalloids

5. Which statement describes the properties of lanthanoids and actinoids?: They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.

Hope this helps :)

Based on patterns of the periodic table, the chemical element which is the least malleable in its solid state is: D. Phosphorus (P).

A periodic table refers to an organized tabular arrangement of all the chemical elements, typically arranged in order of increasing atomic number or number of protons (in rows).

Phosphorus is denoted by the chemical symbol P and it is a chemical element with an atomic number of fifteen (15) and as such it is found in group five (5) of the periodic table.

Malleability is one of the chemical properties of a chemical element and it is simply a measure of it softness such as when hammered.

According to trends (patterns) of the periodic table, Phosphorus (P) is the chemical element which is the least malleable in its solid state.

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Answer:

hydrogen is 1 element but has 2 atoms

Answer:

A cavity is a hole in a tooth that develops from tooth decay Cavities are permanently damaged areas in the hard surface of your teeth that develop into tiny openings or holes .They are caused by a combination of factors, including bacteria in your mouth, frequent snacking, sipping sugary drinks and not cleaning your teeth well.

these are in my own words

Answer:

D. the electron has a neg. charge and is found outside of the nucleus.

Explanation:

the proton has a positive charge, while the neutron has no charge at all. both are found in the nucleus.

the electron has a negative charge, but stays outside of the nucleus in the electron cloud, constantly moving around.

Taking into account the constitution of an atom, the correct statement is "The electron has a negative charge and iş found outside of the nucleus."

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.

Every atom consists of:

In other words, the atomic nucleus is the central part of the atom that is made up of protons and neutrons, while the orbitals or peripheral region is an area where electrons are found.

The neutron is an electrically neutral subatomic particle, while the proton has a positive electrical charge. Electrons have a negative charge, move around the nucleus at different energy levels and are attracted to protons, positive in the atom through electromagnetic force.

In summary, the correct statement is "The electron has a negative charge and iş found outside of the nucleus."

Learn more:

Answer:

Soil pollution is defined as the presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem.