We are asked which of these atoms has the largest number of neutrons in the nucleus?
Recall that the atomic mass is the sum of protons and neutrons.
Recall: Atomic # = # protons
(a) 148Eu
(b) 157Dy
Which of these atoms has the largest number of neutrons in the nucleus?
(a) 148Eu
(b) 157Dy
(c) 149Nd
(d) 162Ho
(e) 159Gd
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