CHEMISTRY HIGH SCHOOL

What is the correct electron configuration for Si (atomic number 14)?A. 1s2 2s2 2p6 3s2 3p2
B. 1s2 2s2 2p6 3s2 3p3
C. 1s2 2s2 2p6 3s1 3p3
D. 1s2 2s2 2p6 3s2 2d3

Answers

Answer 1
Answer: the first one is the correct answer
Answer 2
Answer:

Answer:

1s2 2s2 2p6 3s2 3p2

Explanation:

you're welcome

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As the first five elements in Group 15 are considered in order of increasing atomic number, first ionization energy increases, then decreases decreases, then increases decreases increases

Answers

Answer: the first ionization energy decreases.


Justification:


1) The group 15 is formed by N, P, As, Sb, Bi, and Mc.


2) The first ionization energy is defined as the energy needed to remove an electron from the neutral atom in the gas state.


3) The elements of the group 15 have the following general electron configuration for the valence shell: ns² np³. Where n is the principal quantum number (the same number of the row in which the element is).


4) As you go down in the group, n increases, and the valence electrons are further away of the nucleous, meaning that those electrons are lessen attracted to the nucleous.


Consequently, as you go down in the group, the electrons will be removed more easily, i.e less energy will be required to get them removed.


5) That permits you to predict this order in the first ionization energies: N > P > As > Sb > Bi > Mc.


And that agrees with the data that you can find in a table of first ionization energies.

Final answer:

As atomic number increases, first ionization energy in Group 15 elements initially rises due to increasing nuclear charge, then decreases because of larger atomic radius, and finally increases again due to stronger attraction between cations and remaining electrons.

Explanation:

The first ionization energy refers to the energy necessary to remove an electron from a neutral atom. As we consider the first five elements in Group 15 in order of increasing atomic number, there's a trend that emerges regarding first ionization energy. Initially, the ionization energy increases. This is due to an increasing effective nuclear charge that tightens the hold on the electrons, making it more energy-consuming to remove them.

Then, there's a decrease in ionization energy. This is caused by the additional energy level of electrons, which increases atomic radius and reduces the impact of nuclear charge - it's easier to remove an electron from a larger, higher-energy orbital. Following this, the ionization energy starts increasing again. This is because unrelated to size, it becomes increasingly difficult to remove additional electrons which have a greater electrostatic attraction to the cation that's formed.

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What is work?O A. Force times an object's displacement
B. The distance an object moves over time
C. The time it takes an object to move a certain distance
D. The force that distance makes
SUBMIT

Answers

Answer:

A:force times an object displacement

Explanation:
Answer Force time an object displacement explanation: Search Results
Featured snippet from the web
A force is said to do work if, when acting, there is a displacement of the point of application in the direction of the force. ... Work transfers energy from one place to another, or one form to another. The SI unit of work is the joule (J).

A chemist has dissolved a certain substance in water the chemist knows that more of the substance could be dissolved into the water before it stops dissolving there for the current solution is a.) unsaturated b.) saturated c.) supersaturated

Answers

b.) Unsaturated... Because it can take on more.

If it can't take on more, it's saturated. If it takes more than it can hold, it's supersaturated.

Answer:

unsaturated :)

Explanation:

Why do ionic bonds have strong intermolecular forces? (Imfs)&
Why do covalent bonds have weak intermolecular forces? (Imfs)

Answers

The wording of your question is a bit strange (we usually don't say that bonds have IMFs and ionic compounds don't consist of molecules), but the answer to your question has to do with bond polarity. Strong IMFs are associated with very polar bonds (because increased polarity means greater magnitudes of charges at the poles and, hence, greater electrostatic attraction). Since ionic bonds involve the transfer of entire units of charge (to form cations and anions), they are highly polar (and highly polar means strong IMFs). Polarity in covalent bonds, however, does not arise from transfer of entire units of charge. Rather, they involve unequal sharing of electrons, and thus partial charge. Covalent bonds are, therefore, not as polar as ionic bonds (and less polar means weaker IMFs). I think it would be a good idea to keep in mind, though, that your question should be more along the lines of "Why are ionic bonds more polar than covalent bonds?".

If the half-life of an unstable isotope is 10,000 years, and only 1/8 of the radioactive parent remains in a sample, how old is the sample?

Answers

Have in mind that a radioactive half-life is the amount of time it takes for half of a sample to decay. So, if the amount remaining after x half-lives is (1/2)↑x times the amount you started with. So for 1/18 of radioactive parent then (1/2)↑6 equals 30,000 years

Answer: 30,000

Explanation: I'm taking gradpoint

Which of the following is not an acid? HCl

H2SO4

HNO3

NaOH

Answers

NaOH is not an acid. It is categorized as a base, specifically a strong base, since it has the capability to accept protons from any proton donor and, when it is in aqueous form, it fully dissociates into ions of sodium and hydroxide. 

Any substance that tastes unpleasant in water solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to create salts, and stimulates chemical processes is considered an acid. Here among the given options, NaOH is a base. The correct option is D.

Any hydrogen-containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.

An acid is not NaOH. It is categorized as a base, more specifically a strong base, because it can receive protons from any proton donor and completely dissociates into sodium and hydroxide ions in an aqueous form.

Thus the correct option is D.

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