Chemistry

Chemistry, 12.08.2020 07:01, jonesmegan526

please someone explain this I dont get it at all. how do we know that the 4th electron came from 2p because it's at 4th ionisation? why is it talking about 3s?? how do overall know that aluminium is in group 3 from the table??? thanks

please someone explain this I dont get it at all. how do we know that the 4th electron came from 2p

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