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The nucleus of the lightest hydrogen atom is called the:

APositron
BPhoton
CPhonon
DProton
Answer & Solution
Correct answer: D. Proton
1. Ordinary hydrogen has no neutron in its nucleus. 2. Its nucleus is therefore a single particle. 3. The nucleus of the lightest atom of hydrogen is called the proton. 4. That isotope has a relative abundance of 99.985 per cent. _Source: syllabus Physics Part II, Ch 13 'Nuclei'_
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