Question

Which of the following pair is isoelectronic?<br />1.Na+,Ar<br />2.Mg++,Ca++<br />3.k+,Ar<br />4.Na+,K+<br />EXPLANATION ALSO​

Answer 1

Answer:

A pair which contain equal no. of electron is known as isoelectronic pair.

Explanation:

1. Na+ has 10 electrons but Ar has 18 electrons.so they are not isoelectronic.
2. Mg+2 and Ca+2 has not equal electrons .so they are not isoelectronics.
3. K+ and Ar contains equal electrons .thus both are isoelectronic pair.

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