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22 Oct 2009 20:17:01 IST

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an energy of 24.6eV is requirred to remove one of the electron from neutral helium atom???? find the

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an energy of 24.6eV is requirred to remove one of the electron from neutral helium atom???? find the Energy required to remove both the 2 electron from the neutrallll helium atom?????? plz anwser thiss {{rates assured}}}

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Krishna Gopal Singh

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23 Oct 2009 10:45:20 IST

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I am assuming here that when one electron is removed from helium the radius of other electron remains same.

The first electron is removed against the attraction of 1 unit positive charge and requires 24.6eV energy

The other electron is to be removed against the attraction of 2 unit positive charge and hence energy required = 2*24.6 = 49.2 eV

So total energy required to remove both electrons = 24.6 + 49.2 = 73.8 eV

VARUN RAJ

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24 Oct 2009 08:27:55 IST

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kk if i am not wrong krishna sir is using ... the screening effect the simpler explaination is this .. after removing one electorn helium becomes a hydrogen like atom so enrgy of that electron =13.6z^2 here z=2 or it is equal to 13.6*4 so the toal enrgy required is 13.6*4+24.6

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