Question

What are isoelectronic ions? Account for the decrease in size of the following isoelectronic ions: O2‐ >F‐ >Na+>Mg2+

Answer 1

Hey.....!!!!

Isoelectronic ions are the ions having same no of electrons....
e.g. F- and Na+ both contain 10 electrons each ...

And order of size will be....
O2- > F- > Na+ > Mg2+......

Because more the no of negative charge on element, more is the size & more is the positive charge on element, less is the size....

Hope this helps you...... ☺☺

Answer 2

Answer:

Isoelectronic ions are the ions having same no of electrons.

e.g. F- and Na+ both contain 10 electrons each .

And order of size is:

O2- > F- > Na+ > Mg2+

Because more the number of negative charge on element,  the more is the size & more is the number of positive charge on element, less is the size.

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