PrepRung
Sign inSign up free

NDA 2021 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · hard

Isotopes of an element differ in the number of

Single correct option

Isotopes of an element differ in the number of
  1. A. neutrons
  2. B. protons
  3. C. electrons
  4. D. electrons in the valence shell
Show answer and solution

Answer: (A) neutrons

Isotopes have the same atomic number, i.e. the same protons and electrons, and hence the same chemical properties. They differ in neutron count and therefore in mass number. For example, carbon-12 and carbon-14 both have 6 protons but 6 and 8 neutrons.
Report a mistake

Original question written in the NDA 2021 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake