To determine which element has the highest combined number of protons and neutrons, we can look at the atomic mass (amu) values given. The atomic mass is approximately equal to the total number of protons and neutrons in the nucleus of an atom, since electrons have negligible mass compared to protons and neutrons.
Let's break down the options:
- Nitrogen: 14 amu
- Boron: 10 amu
- Oxygen: 16 amu
- Hydrogen: 1 amu
Among these, Oxygen has the highest combined number of protons and neutrons with a mass of 16 amu. Thus, the answer is Oxygen.
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