Question

The ion of an element has 3 positive charges. The 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

The correct option is B

10

The correct option is (B).

Explanation of the correct option:

Given data-

positive charge = $3$

Mass number = $27$

The number of neutrons=$14$

Mass Number = Number of protons + Number of neutrons

$27$ = Number of protons + $14$

Number of protons= $27-14=13$

Number of protons = Number of electrons =$13$

Since the atom is not electrically neutral, it has a positive charge 3

Then the number of electrons in an ion = $13-3=10$

Hence the number of electrons in the ion is$10$.