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

 

Answer

The electronic configuration of X is 2,8. Since the outermost shell is completely full , it is a noble gas configuration. 

The electronic configuration of Y is 2,8,7. In order to attain noble gas configuration, it needs to gain 1 electron . So, it is a nonmetal .

The electronic configuration of Z is 2,8,2. In order to attain noble gas configuration, it needs to lose 2 electrons . So, it is a metal

So, the correct answer is (d)

  1. Class 10
  2. Chapter 3 Class 10 - Metals and Non-Metals (Term 1)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo