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OpenStudy (anonymous):
Comparing the pairs of elements listed below, choose the pair in which both atoms have nuclei with the same number of neutrons. 147N and 168O 73Li and 94 Be 2311Na and 2412Mg 3216S and 5425Mn
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OpenStudy (wolfe8):
The number on top is proton number/atomic number, number below is nucleon number/mass. Nucleon=neutron+proton
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