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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

2 Answers

5 votes
bromine is the correct answer
User MVck
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3 votes
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. 
User KevinShaffer
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7.2k points