Atoms and Ions

label Chemistry
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For each of the following sets of atoms and ions, arrange the members in order of increasing size. 

Mg2+B3+Be2+

Oct 30th, 2015

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The correct sequence (increasing order of radii) is-

 B3+ < Be2+ <Mg2+

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Oct 30th, 2015

That is the correct answer, but can you explain why and how you got it?


Oct 30th, 2015

Be and B have same number of electronic rings. So their outer most electrons are nearly at same distance from nucleus. B3+ ion has more number of protons pulling the electrons than Be2+, thus its radius is smaller.

For Mg2+, there is an extra electron ring than Be and B ions, thus its size is largest.

This the basic reason.

Oct 30th, 2015

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