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Electrons are a kind of subatomic molecule with a negative charge. Protons are a sort of subatomic molecule with a positive charge.

Given-$S^{2-}$

The atomic number of Sulphur is$16$

The number of protons is$16$

Two electrons are gained when$S^{2-}$is formed,

The number of electrons is$16+2=18$

Electrons are a kind of subatomic molecule with a negative charge. Protons are a sort of subatomic molecule with a positive charge.

Given-$N{i}^{2+}$

The atomic number of Nickel is$28$

The number of protons is$28$

Two electrons are lost when$N{i}^{2+}$ is formed,

The number of electrons is$28-2=26$

Electrons are a kind of subatomic molecule with a negative charge. Protons are a sort of subatomic molecule with a positive charge.
Given -$A{u}^{3+}$

The atomic number of gold is$79$

The number of protons is$79$

Three electrons are lost when$A{u}^{3+}$ is formed,

The number of electrons is$79-3=76$

Electrons are a kind of subatomic molecule with a negative charge. Protons are a sort of subatomic molecule with a positive charge.

Given -$A{g}^{+}$

The atomic number of silver is$47$

The number of protons is$47$

One electron is lost when $A{g}^{+}$is formed,

The number of electrons is$47-1=46$