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  4. 22Ne nucleus, after absorbing energy, decays into two α -particles and an unknown nucleus. The unknown nucleus is

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Q. $^{22}Ne$ nucleus, after absorbing energy, decays into two $\alpha $ -particles and an unknown nucleus. The unknown nucleus is

NTA AbhyasNTA Abhyas 2020Nuclei

Solution:

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
$A=22-$ ( $2\times 4$ ) $=14$
Therefore, unknown nucleus is carbon $\left(\right.A=14,Z=6\left.\right)$