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

1 answer:

3 0

<span>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.</span>

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Answer:

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Explanation:

Given that,

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Where

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