Maharashtra State BoardHSC Science (General) 11th
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Answer the following question. Name the isotopes of hydrogen. Write their atomic composition schematically and explain which of these is radioactive? - Chemistry

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Answer in Brief

Answer the following question.

Name the isotopes of hydrogen. Write their atomic composition schematically and explain which of these is radioactive?

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Solution

  1. Hydrogen has three isotopes i.e., hydrogen \[\ce{(_1^1H)}\], deuterium \[\ce{(_1^2H)}\] and tritium \[\ce{(_1^3H)}\] with mass numbers 1, 2 and 3 respectively.
  2. They all contain one proton and one electron but different number of neutrons in the nucleus.
  3. Atomic composition of isotopes of hydrogen:
    Name of the isotope Symbol Atomic number Z Atomic mass number A Neutron number N Abundance Stability
    Hydrogen \[\ce{H  or _1^1H or H-1}\] 1 1 0 99.98% Stable
    Deuterium \[\ce{D  or _1^2H or H-2}\] 1 2 1 0.015% Stable
    Tritium \[\ce{T  or _1^3H or H-3}\] 1 3 2 Trace Radioactive
  4. Tritium is a radioactive nuclide with a half-life period of 12.4 years and emits low energy β particles.
  5. Schematic representation of isotopes of hydrogen is as follows:
Concept: Hydrogen
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APPEARS IN

Balbharati Chemistry 11th Standard Maharashtra State Board
Chapter 8 Elements of Group 1 and 2
Exercises | Q 3. (D) | Page 122
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