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The elements in group 17 of the periodic table are all called halogens. All halogens have the same

atomic number.
atomic mass.
number of possible isotopes.
number of valence electrons.

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Iamlolol

Answer:

All halogens have the same NUMBER OF VALENCE ELECTRON

The group pf periodic table is based on their valence electron

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victorjose12

Answer:

is the atomic number the atomic number is located on a little square at the left

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