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Neutrons are present in the nucleus of all atoms except:
ALithium
BNitrogen
CHydrogen
DHelium
Answer & Solution
Correct answer: C. Hydrogen
1. One element is the exception.
2. Its nucleus holds a single proton.
3. That element is hydrogen.
_Source: NCERT Class 9 Science, Ch 4 'Structure of the Atom'_
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