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What is the effective nuclear charge, fe...

What is the effective nuclear charge, felt by a 1s electron of the helium atom ?

Text Solution

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Electron configuration of helium atom is `1s^(2)`
Screening constant , `sigma= 1 xx 0.3`
therefore, effective nuclear charge, `Z_(eff)= Z- sigma= 2.0-3.0= 1.7`
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