Which element’s atoms have the greatest average number of neutrons? germanium (ge) arsenic (as) selenium (se) bromine (br)

If you look at the periodic table, the atomic number provides the number of protons in the atom of each element. 
Ge has an atomic number of 32
As has an atomic number of 32
Se has an atomic number of 34
and Br has an atomic number of 35

Therefore, Br has the highest number of protons

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