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What is responsible for the mass defect when protons and neutrons combine to form a nucleus?...

What is responsible for the mass defect when protons and neutrons combine to form a nucleus?

The mass defect comes from the electrons of the newly formed atom.

The mass difference comes from an extra neutron or proton.

The mass defect is due to our inability to measure the masses of subatomic particles accurately enough.

The mass defect arises from mass being converted into nuclear binding energy.

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