JEE Main · 2021 · 27 Jul 2021 · Shift 2 · Hydrogen

The number of neutrons and electrons respectively, present in the radioactive isotope of hydrogen is:

(A)2 and 1✓ Correct
(B)1 and 1
(C)3 and 1
(D)2 and 2

Answer: (A)

Solution

The radioactive isotope of hydrogen is tritium (

^{3}

H or T), which has mass number 3. For hydrogen (atomic number Z = 1), tritium has 1 proton. Number of neutrons = Mass number - Atomic number = 3 - 1 = 2. Since the atom is neutral, the number of electrons equals the number of protons = 1. Therefore, tritium has 2 neutrons and 1 electron.

JEE Main · 2021 · 27 Jul 2021 · Shift 2 · Single correct option

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