Question

G. Which of the following pairs is NOT
isoelectronic ?
a. Na® and Na
b. Mg2® and Ne
c. A13® and B30
d. p3e and N30
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Answer 1

Answer:

option c is right

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Answer 2

Answer:

Mg+2 and Ne

Explanation:

Isoelectronic species means species which have same number of electrons.

Now we have to check

a) Na+ and Na

Na+ has 10 electrons but Na has 11 electrons.

So this is not possible.

b) Mg+2 and Ne

Mg+2 has 10 electrons and Ne also has 10 electrons.

Hence they both are isoelectronic species.

Hence option b is right