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Three elements X, Y and Z have atomic nu...

Three elements X, Y and Z have atomic numbers 7, 10 and 14 respectively.
(i) Identify the group number of these elements in the periodic table.
(ii) Mention one unique feature each of elements Y and Z.
(iii) Which of the above two elements belong to the same period ?

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(i) X - 2, 5 : Group 15
Y - 2, 8 : Group 18
Z - 2, 8, 4 : Group 14
(ii) Y is a noble gas which is unreactive and has complete outermost shell.
Z is metalloid and possesses semi-metal, properties of both metals and non-metals.
(iii) X and Y belong to the same period i.e., `2^(nd)` period.
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