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Be²+ is Isoelectronic with which of the following ions . (a)Li2+ (b)Na+ (c)Mg²+ (d)H+

Be²+ is Isoelectronic with which of the following ions . (a)Li2+ (b)Na+ (c)Mg²+ (d)H+

Grade:12th pass

2 Answers

Beenu Mathew
533 Points
7 years ago
Hi,
i think your question is incorrect as none of the options are right.
This question appeared in AIPMT.
AND THE FIRST OPTION WAS Li+ not 2+
HENCE, Be2+ is isoelectronic with Li+. 
be2+ (atomic number 4...loses two electrons...effective 2)
li+ (atomic number 3...loses one electron..effective 2)
Umakant biswal
5349 Points
7 years ago
@ manisha 
your  options are incorrect . 
what u need to understand is that isoelectronic means that they both have to contain same no of electrons . 
so, if u will calculate be 2+ (the effective electrons is 2 ) 
then it will be isoelectronic with only LI+ . BUT AS the option contains li 2+ then that will not be correct 
and none of the other option satisfy the criterion of same electrons with be 2+ 
HOPE IT HELPS 
in case of other doubts do feel free to post on the forum . 

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