Hydrogen has three isotopes: protium $(^{1}H)$,deuterium ($^{2}H$ or $D$),and tritium ($^{3}H$ or $T$). They have nearly same chemical properties but different physical properties. They differ in......

  • A
    number of protons
  • B
    atomic number
  • C
    electronic configuration
  • D
    atomic mass

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