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Ions

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Question

The number of protons in one atom of an element X is 8. What will be the number of electrons in its ion $X^{2 -}$
(a) 8 (b) 9 (c) 10 (d) 11

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Solution

Answer :

(c) 10
Number of protons is equal to the number of electrons in an atom. It is given that one atom of an element X contains 8 electrons.
Therefore, number of electrons in its ion $X^{2 -}$ = 8 + 2 = 10

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