Zeff for 4s electron in 30Zn is
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sorry I'm not so sure with this question
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Answer:
4.35,
firstly we should know the shielding effect ..
write electronic configuration of zn
arrange from lower to higher value of n
now follow the rules
we get (1×0.35)+(10×0.85)+(8×0.85)+(1×8)+(1×2)
=25.65
zeff=z-shielding constant
=30-25.65
4.35
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