Which electron configuration represents a violation of Hund's Rule? 

Answer the following questions for the elements from cerium through lutetium:

a. Are they metals or nonmetals?

b. To what general class of elements do they belong?

c. What subshell is being filled by electrons in these elements?

Use arrows to show electron pairing in the valence p subshell of

a. Sulfur

b. Bromine

c. Silicon

What is wrong with the following electron configurations?

a. Ni 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰

b. N 1s² 2p⁵

c.

d.

Which of the following atoms has no unpaired electrons?

Which electron configuration represents a violation of the Auf Bau Principle? 

Identify the element with the given electron orbital diagram. 

Write the electron configuration and electron orbital diagram for the following element:

Sulfur   (Z = 16)

Write the ground state electron configuration for the following element:

Magnesium   (Z = 12)