Which of the following is a pair of isotones?

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HP TGT (Non-Medical) TET 2018 Official Paper
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  1. 7N148O16
  2. 6C137N14
  3. 6C12, 6C14
  4. 18Ar3920Ca40

Answer (Detailed Solution Below)

Option 2 : 6C137N14
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Detailed Solution

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Concept:

  • Isotones are atoms or nuclei which have an equal number of neutrons.
  • 17Cl37 and 19K39 both have the same number of neutrons.
  • Isobars are Atoms of a chemical element that have the same atomic mass but a different atomic number.
  • Isotopes are Atoms of a chemical element that have the same atomic number but a different atomic mass.
Explanation:

In 6C137N14

For 6C13

No of proton = 6

No of proton + No of neutron = 13

No of neutron = 13 - 6 = 7
For 7N14:
No of proton = 7
No of proton + No of neutron = 14
No of neutron = 14 - 7 = 7

Thus, we conclude that 6C137N14 are isotones.

Additional Information

    Pair       p + n      p      n
7N148O16 14, 16 7, 8 7, 8
6C137N14 13, 14 6, 7 7, 7
6C126C14 12, 14 6, 6 6, 8
18Ar3920Ca40 39, 40 18, 20 21, 20
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