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​

Answer 1

Answer:

Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion? This is the atomic number of aluminium. Therefore, this element is aluminium.

Explanation:

From mass number and number of neutrons, we can calculate number of protons or electrons which is 13 (mass number -  number of neutrons). Hence, the electronic configuration of this element would be 2, 8, 3. In order to become stable it would lose the last 3 electrons and gain 3 positive charges as given in the question. So, the resultant ion is left with 10 electrons. The element here is Al (aluminium).

Hence correct option is (B).

Answer 2

Answer:

Answer:- From mass number and number of neutrons, we can calculate number of protons or electrons which is 13 (mass number - number of neutrons). Hence, the electronic configuration of this element would be 2, 8, 3. In order to become stable it would lose the last 3 electrons and gain 3 positive charges as given in the question. So, the resultant ion is left with 10 electrons. The element here is Al (aluminium).

Hence correct option is (B)

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