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Science-Bohr Model 2

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is there a pattern betweent he # of electrons in the outers shell of an element and its position along the row in the Perioidic table. whats the pattern?

I know that there is a pattern, but I'm unable to explain. I looked at the first group of elements which included Hydrogen, Lithium, Sodium, etc. Their outer shell only contains one electron.

How can I explain better?

  • Science-Bohr Model 2 - ,

    Group 1 has 1 electron in the outer shell.
    Group 2 has 2 electrons in the outer shell.
    Group 3 has 3 electrons in the outer shellS.(includes 3d and 4s)
    Group 4 has electrons in the outer shellS (includes 3d and 4s).

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