Science-Bohr Model 2

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how many shells r needed 4 the elements in each of the 1st rows of the periodic table.

Im kind of getting confused. When it says rows; does it refer to groups or no? I referred rows to the groups for my last question and came up with a pattern, but now I'm unsure of of myself.

  • Science-Bohr Model 2 -

    Rows go this way ---------

    Columns go this way
    First row needs 1 shell
    Second row needs 2 shells.
    Third row needs 3 shells.

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