Question

The elwments in group 17 of the periodic table are all halogens. All halogens have the same ______.

A. Atomic number
B. Atomic mass
C. Number of possible isotopes
D. number of valence electrons ​

Answer 1

They all have the same number of valence electrons. So the answer is D

Answer 2

Group 17 elements called halogens . All halogens have the same number of valence

electrons