1. The atomic numbers of the three elements X, Y and Z are 2 ,6 and 10
respectively.
(i) Which two element belong to the same group?
(ii) Which two elements belong to the same period?Give reasons.
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Answer:
1 Answer. (i) X and Z. X and Z have zero valency hence they belong to same group: noble gases. (ii) Y and Z.
Explanation:
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