Why is "calcium(II) chloride" an improper name for CaCl2? a.) Because this is not an ionic compound. b.) Because the proper name is "calcium dichloride". c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary. d.) Because chlorine is a diatomic element. e.) Because calcium makes an anion when it makes ionic compounds.

c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary.

Explanation:

Why is "calcium(II) chloride" an improper name for CaCl₂?

a.) Because this is not an ionic compound. NO. This is an ionic compound.

b.) Because the proper name is "calcium dichloride". NO. The proper name is calcium chloride.

c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary. YES.

d.) Because chlorine is a diatomic element. NO. This is unrelated to the name of the compound.

e.) Because calcium makes an anion when it makes ionic compounds. NO. Calcium makes a cation with 2+ charge.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8