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  • 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 (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

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?

(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

Answers (1)

Ans. (d)
X — 2, 8: Has a complete octet, hence it is a noble gas.
Y — 2, 8, 7: It requires one electron to complete its octet.
Hence Y is a non-metal
Z — 2, 8, 2: It has a tendency to lose two electrons to complete its octet.
Hence Z is a metal

Therefore option (d) is correct

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