Among the following, the energy of 2s orbital is lowest in:

 

  • Option 1)

    K

  • Option 2)

    H

  • Option 3)

    Li

  • Option 4)

    Na

Answers (1)

E=-13.6\frac{z^{2}}{n^{2}}  (hydrogen-like species)

E=-13.6\frac{z^{2}eff}{n^{2}} (for other species)

for minimum 2S orbital energy 

Zeff more E less

Zeff of K is the highest 

Zeff more means nuclear charge more on K

 

 


Option 1)

K

Option 2)

H

Option 3)

Li

Option 4)

Na

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