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Wahid Mohanty
Asked: 2022-11-06T07:20:50+05:30 In:

`.^22 Ne` nucleus after absorbing energy decays into two `alpha-`particles and an unknown nucleus. The unknown nucleus is.
A. nitrogen
B. carbon
C. boron
D. oxygen

`.^22 Ne` nucleus after absorbing energy decays into two `alpha-`particles and an unknown nucleus. The unknown nucleus is.
A. nitrogen
B. carbon
C. boron
D. oxygen
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1 Answer

  1. Correct Answer – B
    Atomic number of neon is `10`
    By the emission of two `alpha`-particles, atomic number will be reduced by `4`. Therefore, atomic number of the unknown element will be `Z=10-4=6`
    Similarly mass number of the unknown element will be `A=22-2xx4=14`
    `:.` Unknown nucleus is carbon `(A=14, Z=6)`

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