the elements in group 17 of the periodic table are all called halogens. all halogens have the same\natomic…

the elements in group 17 of the periodic table are all called halogens. all halogens have the same\natomic number.\natomic mass.\nnumber of possible isotopes.\nnumber of valence electrons.

the elements in group 17 of the periodic table are all called halogens. all halogens have the same\natomic number.\natomic mass.\nnumber of possible isotopes.\nnumber of valence electrons.

Answer

Answer:

D. number of valence electrons

Brief Explanation:

Elements in the same group have the same number of valence electrons. Halogens in group 17 all have 7 valence electrons. Each halogen has a unique atomic number, atomic mass, and number of possible isotopes.