DAT General Chemistry: Atomic Structure and Periodic Trends

Question 1

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

Accepted Answer

18

Answer

8

Answer

32

Answer

6

Question 2

Which element has the ground-state electron configuration [Ne]3s²3p⁴?

Accepted Answer

Sulfur

Answer

Carbon

Answer

Oxygen

Answer

Silicon

Question 3

According to the Aufbau principle, which subshell is filled immediately before the 4s subshell?

Accepted Answer

3p

Answer

3d

Answer

4p

Answer

4d

Question 4

What is the wavelength of light with a frequency of 6.0 × 10¹⁴ Hz? (c = 3.0 × 10⁸ m/s)

Accepted Answer

5.0 × 10⁻⁷ m

Answer

2.0 × 10⁶ m

Answer

1.8 × 10²³ m

Answer

5.0 × 10⁻¹ m

Question 5

Which quantum number determines 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 6

Iron has atomic number 26. In which period and group of the periodic table does it appear?

Accepted Answer

Group 8, Period 4

Answer

Group 6, Period 4

Answer

Group 6, Period 3

Answer

Group 8, Period 3

Question 7

Which of the following Period 3 elements has the largest atomic radius?

Accepted Answer

Na

Answer

Mg

Answer

Al

Answer

Si