Question

Two atoms of the same element are found to have different number of neutrons in their nuclei. These two atoms are :

• A. Isomers
• B. lsotopes
• C. Isobars
• D. Allotropes

Answer 1

Answer: (B)

lsotopes

(See all the isotopes of carbon have different no of neutrons.)

Isotopes are atoms with the same number of protons but that have a different number of neutrons. Since the atomic number is equal to the number of protons and the atomic mass is the sum of protons and neutrons, we can also say that isotopes are elements with the same atomic number but different mass numbers.