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Calculate the effective nuclear charge o...

Calculate the effective nuclear charge of the last electron in an atom. The electronic configuration is `1s^(2), 2s^(2)2p^(6), 3s^(2)3p^(5)`.

Text Solution

Verified by Experts

`Z=2+2+6+2+5=17`, and this atom has `3` shells in all.
`:. sigma=(0.35 xx"number of electrons left in nth shell")+ (0.85 xx "number of electrons in (n-1)th shell")+(1.00 xx"total number of electrons in the inner shells")`
`sigma= (0.35xx6) + (0.85xx8)+(1xx2)`
`sigma= 10.9`
Thus, `Z_(eff) = (Z-sigma)`
`= 17-10.9=6.1`
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