Hydrogen has three isotopes : protium ( ${ }^{1} \mathrm{H}$ ), deuterium ( ${ }^{2} \mathrm{H}$ or D ) and tritium ( ${ }^{3} \mathrm{H}$ or T ). They have nearly same chemical properties but different physical properties. They differ in

JEE Main · 2022 · 28 Jun 2022 · Shift 2 · Hydrogen

Hydrogen has three isotopes : protium (

^{1} H

), deuterium (

^{2} H

or D ) and tritium (

^{3} H

or T ). They have nearly same chemical properties but different physical properties. They differ in

(A)number of protons
(B)atomic number
(C)electronic configuration
(D)atomic mass✓ Correct

Answer: (D)

Solution

Isotopes are atoms of the same element with the same number of protons (same atomic number) and same electronic configuration, but different numbers of neutrons. This results in different mass numbers (atomic masses). Protium has 0 neutrons, deuterium has 1 neutron, and tritium has 2 neutrons. Therefore, they differ in atomic mass.

JEE Main · 2022 · 28 Jun 2022 · Shift 2 · Single correct option

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