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Solution


Q.

Predict the nature of the element if the electronic configurations of three elements X, Y and Z are X–2, 8, Y–2, 8, 7 and Z–2, 8, 2 respectively

1 X is a metal.  
2 Y is a metal.  
3 Z is a non-metal.  
4 Y is a non-metal and Z is a metal.  

Ans.

(4)

Electronic configuration of X is 2, 8 = 10 (it is same as the electronic configuration of Neon) Thus, element X is a noble gas element.

Electronic configuration of Y is 2, 8, 7 = 17 (It is same as the electronic configuration of chlorine atom which belongs to halogen family and is a non-metal). Thus, element Y is a non-metal.