The atomic number of an element X is 13. What will be the number of electrons in its ion X³⁺ ?
(a) 11
(b) 15
(c) 16
(d) 10

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Solution

(d) 10
If the atomic number of X is 13, the number of electrons in its X³⁺ ion would be 13 – 3 = 10.

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