Atoms of ca and s would be expected to react in a ratio of
a) 1: 1
b) 1: 2
c)2: 1
d)3: 1

Option A = 1:1

Explanation:

The atoms of calcium and sulphur when react their ration is 1:1. The charge on calcium is +2 and on sulphur is -2.

Ca⁺²S⁻²

The +2 and -2 charges are cancel out and overall charge will be zero.

CaS

so their atomic ratio will be 1:1

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