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Which of the following elements has the highest combined number of protons and neutrons?

Hydrogen: 1 amu
Nitrogen: 14 amu
Oxygen: 16 amu
Boron: 10 amu

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Nitrogen has the highest combined number of protons and neutrons because it has 14 protons and 14 neutrons, giving it a total atomic mass of 28 amu.

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