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18 February, 08:07

How does an elements period number related to the number of the energy level of its valence electrons?

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  1. 18 February, 10:32
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    There is a direct correlation between the period number and the energy level for valence electrons. For example, the H and He elements, in period 1, have their outer electrons in the energy level "1". This continues down the rows: all the elements in period 2 have their principal energy level as n = 2, period 3 has n = 3, and so on.
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