Q. 104.9( 7 Votes )

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Answer :

The electronic configuration 2,8,2 shows that there are 2 valance electrons in the outermost shell hence it belongs to group two and it has 3 shells (K, L, M) thus belongs to period three.


The Group Number tells us the number of valance electrons


The Period Number tell us the number of shells


M is magnesium (2,8,2) with atomic number 12.


The chemical formula of the compounds formed are:


(i) Mg2+ + NO3- Mg (NO3)2 (magnesium nitrate)


(ii) Mg2+ + SO42- Mg (SO4)(magnesium sulphate)


(iii) Mg2+ + PO43- Mg3 (PO4)2 (magnesium phosphate)


‘M’ will form ionic compounds by losing two valence electrons to achieve a noble gas configuration, that is, a stable octet in the valence shell.


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