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6 September, 08:57

An atom contains a total of 25 electrons. When the atom is in the ground state, how many different principal energy levels will contain electrons

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  1. 6 September, 11:08
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    The energy levels fill up as follows

    1s2, 2s2 2p6, 3s2 3p6 4s2 3d10

    so 7 energy levels will contain electrons.
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