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The electronic configuration of three cl...

The electronic configuration of three clements X, Y and Z are given below ,
X = 2 , Y = 2, 6 , Z = 2, 8, 2.
(i) Which element belongs to the second period ? (ii) Which element belongs to the eighteenth group ?
(iii) Which element belongs to the second group ? (iv) What is the valency of Y ?
(v) Are Y and Z metals or non-metals ?

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