Correct Answer: Option B

Explanation

The atomic number of Neon (Z) is 10. In a neutral atom, the number of electrons is equal to the atomic number. Therefore, Neon has 10 electrons. 

Isoelectronic species are atoms or ions that have the same number of electrons. To find the correct match, calculate the number of electrons for each given ion: 

K\(^+\) = A +1 charge means it has lost 1 electron. Electrons = 19 - 1 = 18 electrons

Mg\(^{2+}\) = A +2 charge means it has lost 2 electrons. Electrons = 12 - 2 = 10 electrons

Ca\(^{2+}\) = A +2 charge means it has lost 2 electrons. Electrons = 20 - 2 = 18 electrons

Li\(^+\) = A +1 charge means it has lost 1 electron. Electrons = 3 - 1 = 2 electrons

Neon has 10 electrons. Among the choices, only Mg\(^{2+}\) has 10 electrons. Hence, they are isoelectronic.

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