What are isotopes? Write the names of isotopes of hydrogen.

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Q. What are isotopes? Write the names of isotopes of hydrogen.

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Step 1. Isotopes are atoms of the same element -- meaning the same number of protons (same atomic number) -- that differ in the number of neutrons in the nucleus, and therefore in mass number.

Step 2. Hydrogen's three naturally occurring isotopes are: protium ( $_1^1H$ , no neutron, 99.985% abundant), deuterium ( $_1^2H$ , or D, one neutron, ~0.015% abundant), and tritium ( $_1^3H$ , or T, two neutrons, radioactive trace amounts). …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2026Set ANNUAL1 markMCQ
$Q. How many neutrons are there in protium ?$
(a) 0
(b) 1
(c) 2
(d) 3
›Reveal solutionSolution

Protium has no neutrons.

Protium is the lightest isotope of hydrogen, symbol 1/1 H. It has 1 proton, 1 electron and no neutrons (mass number 1 = 1 proton + 0 neutrons …

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CBSE 2024Set ANNUAL1 markMCQ
$Q. Tritium is an isotope of which of the following?$
(a) Hydrogen
(b) Tellurium
(c) Titanium
(d) Tantalum
›Reveal solutionSolution

Tritium is the radioactive isotope of hydrogen with 1 proton and 2 neutrons.

Hydrogen has three isotopes: protium (¹H, no neutrons, the most abundant), deuterium (²H or D, 1 neutron), and tritium (³H or T, 2 neutrons, radioactive with a half-life of about 12.3 years). All three h …

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CBSE 2023Set annual1 mark
$Q. Which isotope of hydrogen is radioactive?$
›Reveal solutionSolution
Among hydrogen's three isotopes (protium, deuterium, tritium), only tritium is radioactive.

Hydrogen has three naturally occurring isotopes, all with 1 proton but differing numbers of neutrons:

Protium (1-H): 0 neutrons, the most abundant (about 99.98%), stable.

Deuterium (2-H or D): 1 neutron, stable, used in heavy water (D2O). …
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$Q. Duterium differs from hydrogen in$
(a) Chemical properties
(b) Physical properties
(c) Both physical and chemical properties
(d) Radioactive prperties
›Reveal solutionSolution

Deuterium differs from hydrogen in physical properties.

Deuterium (2H, D) and protium (1H) are isotopes: they have the same atomic number (1) and the same electronic configuration (one electron), so their chemical properties are essentially identical. They differ in mass (deuterium is about twice as heavy), which affects mass-dependent physical properties such as density, boiling point, freezing point and reaction rate. Deuterium …

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Q.What are isotopes? Write the names of isotopes of hydrogen.

Concept understanding — Isotopes of Hydrogen

Q.What are isotopes? Write the names of isotopes of hydrogen.

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