Question:
The ion of an element has three positive change. Mass number of the atom is 27, and the number of neutrons is 14. What is the number of electrons in the ion? [WBCS Pre 2023]
(A) 13
(B) 10
(C) 14
(D) 16
Answer:
(B) 10
Explanation:
To find the number of electrons in the ion, you first need to determine the number of protons in the ion. Since the mass number (number of protons + number of neutrons) is 27 and the number of neutrons is 14, the number of protons is 27 - 14 = 13.
Given that the ion has three positive charges, it has lost three electrons compared to the neutral atom. So, the number of electrons in the ion is 13 - 3 = 10.
Therefore, the answer is (B) 10.