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5 July, 06:25

An atom has the following electron configuration 1s2 2s2 2p6 3s2 3p4. How many valence electrons does this Atom have

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  1. 5 July, 06:40
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    6

    Explanation:

    This atom is sulfur (if the electrons are equal to the protons/not an ion). You can tell the number of valence electrons by looking at the individual shell. The first shell (1s) can only hold 2 electrons. The second shell (2s and 2p) can hold 8 electrons. The third shell (3s and 3p), which is the valence shell, only has 6 out of its possible 8 electrons, so this atom has 6 valence electrons.
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