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08/10/2021 5:52 pm
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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.
1 Answer
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08/10/2021 5:52 pm
(i) X and Z.
X and Z have zero valency hence they belong to same group: 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.