Identify: A) An element whose electron configuration ends in 2p

Identify:

A) An element whose electron configuration ends in 2p?

B) family of elements having 2 valence electrons?

C) an element having a completely filled 3p orbital?

D) Element having an unpaired electron in its 4s orbital?

A) Oxygen
B) Akali Earth Metals
C) Chlorine
D) Potassium