Arrange the elements in decreasing order of the number of valence electrons

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asked by M
  1. A valence electron is an electron in the outside shell. Br has 7, S has 6, Na has 1. Look at the group of the periodic table in which the electron is found. That often tells you the number of valence electrons. I don't know how your are supposed to handle a "decreasing order" when you run into Br with 7 and F with 7 since both are the same.
    Here is a good site for you.

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    posted by DrBob222
  2. rye

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    posted by rt

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