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Why do elements that are in the same group of the periodic table share similar properties?

They all have the same atomic mass.
They are all very reactive with other elements.
They are all metals.
They all have the same number of electrons in the outer shell.
They all have the same number of electrons in the outer shell.

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2 answers

  1. d and e

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  2. for connexus practice its
    D(only this one is wrong)
    B
    B
    C
    C
    C
    B
    B
    should get u 7/8.

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