Question

Choose the correct statement(s).

• A. Protium is the lightest isotope of hydrogen
• B. Deuterium is heavier than tritium.
• C. Protium is heavier than deuterium.
• D. Tritium is heavier than protium.

Answer 1

Answer: (A), (D)

The correct options are
A

Protium is the lightest isotope of hydrogen

D

Tritium is heavier than protium.

Hydrogen has three isotopes: Protium, Deuterium and Tritium.
Protium is the lightest isotope as an atom of protium has only 1 proton and no neutrons.
Deuterium is the second lightest isotope of hydrogen as it has 1 proton and 1 neutron.
Tritium is the heaviest isotope of hydrogen as it has 1 proton and 2 neutrons.

Hence, the increasing order of isotopes with respect to mass is Protium < Dueterium < Tritium