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  4. Be2 + is isoelectronic with which of the following ions?

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Q. $Be^{2 +}$ is isoelectronic with which of the following ions?

NTA AbhyasNTA Abhyas 2020Classification of Elements and Periodicity in Properties

Solution:

As $Li^{+}$ and $Be^{2 +}$ both have 2 electrons so they are iso electronic. Rest other ions have different number of electrons than $Be^{2 +}$ so there is no relation between them. $Na^{+}$ , $Mg^{2 +}$ both have 10 electrons.