1. Hydrogen
  2. Calcium
  3. Chlorine
  4. Nitrogen
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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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