Answers

2016-02-12T02:40:41+05:30
X = 12 = magnesium
y = 16 = sulphur
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2016-02-12T08:53:26+05:30
atomic number of 'X' is 12 i.e magnesium(Mg) and atomic number of 'Y' is 16 i.e is sulphur(S).
i hope it helps.................
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