Question

Two atoms having the same number of electrons and also protons but different numbers of nucleons are called

• A. isotones
• B. isotopes
• C. isobars
• D. isomers

Answer 1

The correct option is B

isotopes

• The atoms of elements have the same atomic number but a different mass number is known as Isotopes of an element.
• Atomic number = number of protons = number of electrons.
• Since, Mass number = number of protons + number of neutrons
• Mass number = atomic number + number of neutrons
• Since the mass number is different in isotopes, it is due to the difference in the number of neutrons.
• Two atoms having the same number of electrons and also protons but different numbers of nucleons are called Isotopes.
• Hence, option B is correct.