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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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Answer :

Final answer:

Halogens in Group 17 have seven valence electrons, making them highly reactive.


Explanation:

Halogens are elements in Group 17 of the periodic table. They have seven valence electrons, making them highly reactive. All halogens have the same number of valence electrons, which is seven.


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