Problem: A proton weighs 1.007276 amu, a neutron weighs 1.008665 amu, and an electron weighs 5.486 × 10−4 amu.What is the expected mass of a beryllium-9 nucleus, based on the total mass of its protons and neutrons? Express your answer in atomic mass units using seven significant figures.

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A proton weighs 1.007276 amu, a neutron weighs 1.008665 amu, and an electron weighs 5.486 × 10−4 amu.

What is the expected mass of a beryllium-9 nucleus, based on the total mass of its protons and neutrons? Express your answer in atomic mass units using seven significant figures.

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