Chemistry Test Atomic Structure 2

Question 1

Which quantum number describes the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number (l)

Answer

Principal quantum number (n)

Answer

Magnetic quantum number (ml)

Answer

Spin quantum number (ms)

Question 2

An atom has 17 protons and 18 neutrons. What is its mass number?

Accepted Answer

35

Answer

17

Answer

18

Answer

1

Question 3

Which of the following correctly describes isotopes?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons

Answer

Atoms with the same mass number but different atomic numbers

Answer

Atoms with the same number of electrons but different numbers of protons

Answer

Atoms with the same number of neutrons but different numbers of electrons

Question 4

In Bohr's model of the hydrogen atom, what happens when an electron absorbs energy?

Accepted Answer

It jumps to a higher energy level

Answer

It moves to a lower energy level

Answer

It is ejected from the atom

Answer

It slows down in its orbit

Question 5

What is the maximum number of electrons that can occupy the third principal energy level (n=3)?

Accepted Answer

18

Answer

8

Answer

10

Answer

32

Question 6

Which subshell is filled after the 4s subshell according to the Aufbau principle?

Accepted Answer

3d

Answer

4p

Answer

4d

Answer

5s

Question 7

A neutral atom has an electron configuration of 1s²2s²2p⁶3s²3p⁵. How many valence electrons does it have?

Accepted Answer

7

Answer

5

Answer

2

Answer

17