36. The electronic configurations of three elements X, Y and Z are X -2,8; Y – 2,8,7 and Z-
2, 8, 2. Which of the following is correct ? [NCERT Exemplar Problems]
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
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Answer:
d) Y is a non-metal and Z is a metal.
Explanation:
Element X has it's valence shell filled and it has noble gas configuration. So it is a noble gas and non metal
Element Y have to gain one electron to attain noble gas configuration. So this element forms an anion so it is a non-metal.
Element Z has two electrons on it's valence electron and it should lose them to attain noble gas configuration. So thus element forms a cation so this is a metal
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