Question

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

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Answer 1

Answer:

(d) Y is a non-metal and Z is a metal

Explanation:

X=2,8=10:  It is the electronic configuration of neon.

Y=2,8,7=17: It is the configuration of the halogen family of chlorine atom which is non-metal

Z=2,8,2=12: It is the configuration of alkaline earth metals of magnesium atom which is metal.

Therefore, X is a noble gas, Y is a non-metal, and Z is a metal.

Option D is correct.