AP Chemistry : Other Atomic Concepts

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #1 : Other Atomic Concepts

As atomic radius decreases, the force of attraction between the nucleus of the atom and its electrons __________.

Possible Answers:

decreases

cannot be determined

increases

stays the same

Correct answer:

increases

Explanation:

As the atomic radius decreases, electrons are drawn closer to the nucleus. Since the electromagnetic force between the positively charged nucleus and negatively charged electrons is a function of distance, the force of attraction, or effective nuclear charge, exerted on each electron will be greater.

Example Question #2 : Other Atomic Concepts

What is the shorthand electron configuration for gallium?

Possible Answers:

Correct answer:

Explanation:

To write out the shorthand electronic configuration for Ga, you simply write down the noble gas that that comes before , in this case , then write the rest of the electron configuration as normal.

Example Question #3 : Other Atomic Concepts

An electron falling to a lower energy level gives off a blue glow (λ=475nm). How much energy is emitted?

Possible Answers:

4.184 x 10-17 J

3.14x10-40J

4.184 x 10-19 J

3.14x10-37J

Energy is not emitted

Correct answer:

4.184 x 10-19 J

Explanation:

E=hf, or E=hc/λ

h is Planck's constant with a value of 6.62606957 × 10-34 m2 kg / s. Converting 475nm to m gives 4.75x10-7m. c is the speed of light with 3x108m/s. Putting these variables into the second equation you get 4.174x10-19J

Example Question #4 : Other Atomic Concepts

The atomic number of an atom is equal to the number of __________.

Possible Answers:

protons

neutrons

electrons + neutrons

protons + neutrons

electrons

Correct answer:

protons

Explanation:

The atomic number is equal to the number of protons, because no two elements have the same number of protons. It is however possible for different elements to have the same number of electrons (through the loss or gain of electrons) or neutrons (isotopes). 

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