Atoms of Ca and S would be expected to react in a ratio of… ?

a. 1:1

Answer 1

a. 1:1

Because Ca has a charge of 2+ and S has a charge of 2-, so if you cross multiply those charges you get Ca2S2, which can simplify to CaS, a 1:1 ratio.

…S does not have a charge of 3-

Answer 2

none of the above.

ionic charge of Ca is +2, S is -3
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