Number of electrons in its outermost as well as penultimate, Chemistry

Which among the following species have the same number of electrons in its outermost as well as penultimate shell:

(1) Mg2+                             

(2) O2-              

(3) F-                        

(4) Ca2+

Ans: Ca2+

 

Posted Date: 5/17/2013 7:51:13 AM | Location : United States







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