Question

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Answer 1

Answer:

2+8+8 = 18

Ca^(2+)

2+ means two less from electronic configuration

Atomic number of Ca = 20

20-2 = 18

therefore Ca^(2+) is answer✓

S^(2-)

2- means two more to electronic configuration.

Atomic number of Sulphur = 16

16+2 = 18

therefore S^(-2) is the answer✓

so option C is answer.

Answer 2

Answer:

c

Explanation: