# chemistry

How do i calculate the effective nuclear charge of a 3d electron of copper?
what is the zeff. for a electron in the 3d orbital of copper.
i looked up the answer to be 13.20, but i calculated 13.05
this is my work:
(1s2)(2s2 2p6)(3s2 3p6)(3d10)(4s1)
.35(17)+1(10)=15.95
29-15.95=13.05
what am i doing wrong?

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1. How do i calculate the effective nuclear charge of a 3d electron of copper?
what is the zeff. for a electron in the 3d orbital of copper.
i looked up the answer to be 13.20, but i calculated 13.05
this is my work:
(1s2)(2s2 2p6)(3s2 3p6)(3d10)(4s1)
.35(17)+1(10)=15.95
29-15.95=13.05
what am i doing wrong?

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2. 👎 0
posted by mandy
2. I would think 13.15.
(0.35*9) for the other electrons in the same group.
(nothing for the 3s2 and 3p6 because they are not in the same grouping as 3d AND they are in the SAME principal quantum number of 3; i.e., not n-1 or <n-1).
Then 10 for the remaining 1s2, 2s2 2p6 = 3.15 + 10 = 13.15 the way I do it.

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3. That's the shielding.

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4. so then Zeff=z-s
therfore 15.95-13.15 and that gives me the answer?

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posted by mandy
5. i don't get it

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posted by mandy
6. For a copper atom what is the value of Z ?

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posted by mandy
7. For a 3d electron in a copper atom, what is the value of s
?

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posted by mandy
8. 21.15

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posted by Pooja

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2. 👎 0

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