Question 2A.9 7th Edition

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Layal Suboh 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Question 2A.9 7th Edition

Postby Layal Suboh 1I » Wed Oct 31, 2018 9:17 pm


I'm having difficulty with this problem from the homework:

Which M3+ ions (where M is a metal) are predicted have the following ground-state electron configurations: (a) [Ar] 3d6; (b) [Ar] 3d5; (c) [Kr] 4d5; (d) 4d3.

I thought you would add 3 electrons to each electron configuration, but the answers just find the element with that specific electron configuration.


Samantha Pacheco 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Question 2A.9 7th Edition

Postby Samantha Pacheco 2K » Wed Oct 31, 2018 9:54 pm

When an atom has a 3+ charge that means they have lost electrons therefore you must subtract electrons not add them. The question is asking you to identify the element that would have that specific electron configuration after losing 3 electrons. For example a neutral Co has and electron configuration of [Ar] 4s2 3d7 but when it has a 3+ charge, it becomes Co3+, which means it has lost 3 electrons and its electron configuration is now [Ar] 3d6.

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