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Electron configuration

Posted: Sun Oct 28, 2018 1:24 pm
by sarahtang4B
What is the ground state e- configuration for Ru 3+?

Why is the configuration for Ru3+ [Kr] 4d5 and not [Kr]4d3 5s2.

Re: Electron configuration

Posted: Sun Oct 28, 2018 2:16 pm
by mbaker4E
Electrons are always removed from the outermost shell because those are the electrons with the highest energy and are therefore the most unstable. 5s has more energy than 4d and therefore when Ru is ionized electrons are taken from the 5s orbital first.