Electron configuration
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Re: Electron configuration
I don't think we can do that. Although they're isoelectronic, they don't necessarily have the same properties because they have a different amount of protons. I believe you would go off of the previous noble gas, which is Neon, and then write the 3s orbital and 3p orbital. So, the configuration would be [Ne] 3s^2 3p^6.
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Re: Electron configuration
It depends on the question if they ask for the ‘full ground state’ then you cant use the short hand, but if they don’t then you could write it as [Ar] to represent that it lost the 2 electrons from the +2 charge. If the question states you can use the abbreviation then yes, if not then no.
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Re: Electron configuration
No, you would have to write out Ca as a ground configuration initially and then at the very end with your final electron configuration, remove two electrons as appropriate for Ca^2+
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