Question

Which element’s atoms have the greatest average number of neutrons?

A. germanium (Ge) 72.61
B. arsenic (As) 74.92
C. selenium (Se) 78.96
D. bromine (Br) 79.90

Answer 1

when atom has a high neutron to proton ration that is very sustainable and thus radioactive. The more neutrons an atom has the more radioactive it is. 

Answer 2

bromine is the correct answer