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  • The electronic configurations of four elements are given below: Arrange these elements in the correct order of the magnitude (without signs) of their electron gain enthalpy? 1)2s2</s

The electronic configurations of four elements are given below: Arrange these elements in the correct order of the magnitude (without signs) of their electron gain enthalpy?

1)2s22p5 
2)3s23p5  
3)2s22p4
4)3s23p4

Option: 1

1<2<3<4


Option: 2

2<1<4<3


Option: 3

1<3<4<2


Option: 4

3<4<1<2


Answers (1)

Elements with half or full-filled orbitals are more stable. Energy is required to add an electron since they do not accept electron easily.

Electronic configuration 1,2, 3 & 4 represents F, Cl ,O & S

Left to right in a period then \mathrm{\Delta _{eg} H} becomes more negative 

Top to bottom in a group then \mathrm{\Delta _{eg} H} becomes less negative 

Correct order is: O < S < F < Cl   

So, order is  3 < 4 < 1 < 2

Hence, option number (4) is correct.

Posted by

Kshitij

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