d5 in electron configurations

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Joanna Mendoza 3J
Posts: 20
Joined: Sat Aug 24, 2019 12:17 am

d5 in electron configurations

Postby Joanna Mendoza 3J » Sun Oct 27, 2019 12:51 pm

For the ion Ru3+ the solutions manual states that the electron configuration is [Kr]4d^5 instead of [Kr]4d^35 s^2. Can someone explain why the orbitals are taken from the s orbital instead of the d orbital?

Jonathan Gong 2H
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

Re: d5 in electron configurations

Postby Jonathan Gong 2H » Sun Oct 27, 2019 2:38 pm

When an atom is ionized, electrons are alway removed from the outermost shell. In this example, Ru3+, the outermost shell is 5s. Thus, 2 electrons are removed from that s orbital while 1 electron is removed from the d orbital. This leads to the electron configuration [Ar] 4d^5. Hope this helps.

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