Question

Na+ ion is isoelectronic with
a)Li+
b)Mg2+
c)Ca2+
d)Ba2+


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Answer 1

Answer:

Mg2+

Explanation:

Answer 2

Answer: b) $\mathrm{Mg}^{2+}$

Explanation:

Atomic number of $\mathrm{Na}$ = 11

Number of electrons in $\mathrm{Na}^{+}$ = 11 - 1 = 10

Atomic number of $\mathrm{Li}$ = 3

Number of electrons in $\mathrm{Li}^{+}$ = 3 - 1 = 2

Atomic number of $\mathrm{Mg}$ = 12

Number of electrons in $\mathrm{Mg}^{2+}$ = 12 - 2 = 10

Atomic number of $\mathrm{Ca}$ = 20

Number of electrons in $\mathrm{Ca}^{2+}$ = 20 - 2 = 18

Atomic number of $\mathrm{Ba}$ = 4

Number of electrons in $\mathrm{Ba}^{2+}$ = 4 - 2 = 2

Therefore, $\mathrm{Mg}^{2+}$ is isoelectronic with $\mathrm{Na}^{+}$ with 10 electrons each