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  • The electronic configuration of element A is 1s22s22p63s2 and of B is 1s22s22

The electronic configuration of element A is 1s22s22p63s2 and of B is 1s22s22p5. The formula of the compound is:

Option: 1

AB


Option: 2

A2B


Option: 3

AB2


Option: 4

A2B3


Answers (1)

best_answer

Classification of Elements : s-block -

  • The elements having ns1 and ns2 electronic configurations in their outermost shell are called s-block elements. 

  • Elements With ns1 configuration are called group 1 (alkali elements). 

  • Elements With ns2 configuration are called group 2 (alkaline earth elements).

  • They show fix valency and oxidation states. 

  • The loss of the outermost electrons(s) occurs readily to form M+ (in case of alkali metals) or M2+ ions (in case of alkaline earth elements). 

 

The outermost electrons of any element determine the valency of the element. Thus valency of A is 2 and that of B is 1. Thus, the formula of the compound is AB2.

Therefore, Option(3) is correct

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Sayak

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