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Option 1 : Hydrogen
- Hydrogen is the only atom in which neutrons are not present.
- Hydrogen is the lightest element in the periodic table.
- Atomic No. = 1
- Neutrons were discovered by Chadwick.
- It has no charge and 1.00867u mass.
- It is present inside the nucleus.
- The antiparticle of neutron is antineutrino.
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