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The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively. Which two elements belong to the same group ? 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: 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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