2A.19 7th edition

Moderators: Chem_Mod, Chem_Admin

Katie Frei 1L
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

2A.19 7th edition

Postby Katie Frei 1L » Wed Oct 31, 2018 8:01 pm

Hello! Could someone please explain to me why for part e) of this question the electron configuration of Ni^+2 is [Ar]3d^8 instead of [Ar]3d^6 4s^2. Thank you!

Lumbini Chandrasekera 1B
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: 2A.19 7th edition

Postby Lumbini Chandrasekera 1B » Wed Oct 31, 2018 9:13 pm

I think it [Ar] 3d^8 because lower principle energy levels should be filled with electrons first before the next energy level (n=4) is filled which is why it wouldn't be [Ar] 3d^6 4s^2.

Nicole Lee 4E
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 1 time

Re: 2A.19 7th edition

Postby Nicole Lee 4E » Thu Nov 01, 2018 11:35 am

Electrons are removed from the 4s orbital before 3d electrons are removed, so you get [Ar]3d^8 instead of [Ar]3d^6 4s^2.

Theodore_Herring_1A
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: 2A.19 7th edition

Postby Theodore_Herring_1A » Thu Nov 01, 2018 2:24 pm

The electrons are removed from the 4s orbital before 3d when forming ions. This is because electrons are always removed from the outermost orbital first, in this case 4s. This is why it is [Ar]3d8 and not [Ar]3d64s2.


Return to “Ionic & Covalent Bonds”

Who is online

Users browsing this forum: No registered users and 2 guests