Among the following, the elements with even number of neutrons is

Among the following, the elements with even number of neutrons is

A
Na
B
Al
C
Ne
D
He

Solution:

The formula for neutrons is n= A- Z

For ${}_{11}^{23}{Na} \to n = 23 - 11 = 12$

For ${}_{13}^{27}{Al} \to n = 27 - 13 = 14 (Even)$

For ${}_{10}^{20}{Ne} \to n = 20 - 10 = 10 (even)$

For ${}_{2}^{4}{He} \to n = 4 - 2 = 2 (Even)$

Hence, all the options are correct.

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