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Structure of Atom question

2020 · 8 Jan · Shift 2 · Q12
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Structure of Atom question

2020 · 8 Jan · Shift 2 · Q12

JEE MainChemistryStructure of AtomMCQ+4 / −1
Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) an (z) is :
  1. A
    3
  2. B
    1
  3. C
    4
  4. D
    2
View written solutionFree

Correct answer: A

  1. Identify the three isotopes of hydrogen

    Hydrogen has three isotopes:

    • Protium: 11H^1_1\mathrm{H}11​H
    • Deuterium: 12H^2_1\mathrm{H}12​H
    • Tritium: 13H^3_1\mathrm{H}13​H

  2. Use the relation for number of neutrons

    Number of neutrons === Mass number −-− Atomic number

    Since hydrogen has atomic number 111 for all its isotopes:

    • For protium 11H^1_1\mathrm{H}11​H: x=1−1=0x = 1 - 1 = 0x=1−1=0

    • For deuterium 12H^2_1\mathrm{H}12​H: y=2−1=1y = 2 - 1 = 1y=2−1=1

    • For tritium 13H^3_1\mathrm{H}13​H: z=3−1=2z = 3 - 1 = 2z=3−1=2

  3. Find the sum

    x+y+z=0+1+2=3x + y + z = 0 + 1 + 2 = 3x+y+z=0+1+2=3

  4. Match with the options

    The correct option is A: 3.

  5. Compare with stored correct answer

    Stored correct answer: A

    Our derived answer is also A. Hence, they agree.

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