About the number of subatomic particles in an ion of $_{16}^{32} S^{2 -}$ , which is/are true?

I. $16$ protons
II. $14$ neutrons
III. $18$ electrons

II only

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III only

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I and II only

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I and III only

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I, II and III

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Solution

The correct option is E I and III only
No of protons equals atomic number i.e. 16.

Since -2 charge is due to gain of 2 electrons by sulphide anion.

Therefore the number of electrons increases from 16+2 i.e. 18.

No of neutrons equal mass no $-$ no of protons i.e. $32 - 16$ is 16.

Hence, option $D$ is correct.

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