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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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Respuesta :

mariahderenzo

Answer:

They have the same number of valence electrons

Explanation:

The groups on the periodic table are the vertical lines of groups. In group 18 the elements are known as noble gases. They have all 8 valence electrons. As you go to the left the groups have one less valence electron. Group 17 has 7 valence electrons.

ali1518
number of valence electrons

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