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: NCERT Class XII Physics Part II, Ch 13 'Nuclei'_
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