Question

What would the molecular formula be if lithium and sulfur reacted to form a neutral compound?

A. Li2S2
B. LiS2
C. LiS
D. Li2S

Answer 1

D would be your answer.
Lithium has a valence electrons of one.
Sulfur has two valence electrons.
Now you cross it these numbers and bring them down.

Answer 2

D

Step-by-step explanation:

Lithium has one valence electron, so it has one to give away to have an outer shell of 8.

Sulfur has 6 valence electrons, so it needs 2 to get an outer shell of 8.

If we have two Li, that means sulfur will get 2 e- and Li will give away 2 e-, so the formula is Li₂S.