The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively. (i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Give reasons for your choice.
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Answer:
(i) X and Z:
X and Z have zero valency hence they belong to same group of noble gases.
(ii) Y and Z:
Y = 2,4 and Z = 2,8 so both of them belong to second period with two shells filled.
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