can anyone answer the above question
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sorry I acn not give answer of this
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may be element B and D are same ...
Explanation:
both having same valence electron..
A is Magnesium
B is nittogen
C is calcium
D is sulphur
.. for B 1s2 2s2 2p3
and for D 1s2 2s2 2p6 3s2 3p3...
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