The ion of an element has 3 positive charges.
Question:

The ion of an element has 3 positive charges. Mass, number of the atom is 27 and the number of neutrons is 14 . What is the number of electrons in the ion?

(a) 13

(b) 10

(c) 14

(d) $16 .$

Solution:

(b) The ion has 13 protons $(27-14)$ and 10 electrons. It is $\mathrm{Al}^{3+}$ ion.

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