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2 August, 20:52

The election configuration has of an element is 1s^2 2s^2 2p^1. How many valence electrons does the element have?

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  1. 2 August, 22:18
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    it has 3 valence electrons

    Explanation:

    2+2+1 is 5, boron is 5 and its in the 3rd group
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