electron configuration for ions

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Haley Dveirin 1E
Posts: 101
Joined: Sat Jul 20, 2019 12:17 am

electron configuration for ions

Postby Haley Dveirin 1E » Wed Oct 23, 2019 9:48 pm

how come when the book asks you to give the ground-state electron configuration for Ni^2+, the answer is [Ar]3d^8 and not [Ar]3d^64s^2?

Kellylin_4D
Posts: 66
Joined: Sat Aug 24, 2019 12:17 am

Re: electron configuration for ions

Postby Kellylin_4D » Wed Oct 23, 2019 10:06 pm

I believe it's because you have to remove electrons from the highest energy first, even though it is not like that in this case when electrons are being added.

Lindsey Chheng 1E
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

Re: electron configuration for ions

Postby Lindsey Chheng 1E » Thu Oct 24, 2019 1:02 am

Haley Dveirin 4B wrote:how come when the book asks you to give the ground-state electron configuration for Ni^2+, the answer is [Ar]3d^8 and not [Ar]3d^64s^2?

You have to remove electrons from the highest energy shell first, which in this case would be n=4. This is because the electrons in the highest energy shell, which is the farthest away from the nucleus, are held less tightly due to the inner electrons in the lower energy shells shielding them from the attraction to the positively charged nucleus.

Junwei Sun 4I
Posts: 125
Joined: Wed Oct 02, 2019 12:16 am

Re: electron configuration for ions

Postby Junwei Sun 4I » Thu Oct 24, 2019 8:15 pm

Because electrons are removed from the highest energy level first. When electrons are filled in 3d orbitals, 4s orbital has higher energy than 3d. Therefore when electrons are removed electrons from higher energy level are removed first. That's why Ni2+ has ground-state electron configuration of [Ar]3d^8.


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