Hydrogen Facts



  • Hydrogen is the lightest of all gases and of all elements. A large swimming pool full of hydrogen would weigh just 1 kg.
  • Hydrogen is the smallest and simplest of all atoms, with just one proton and one electron.
  • Hydrogen is the first element in the Periodic Table. It has an Atomic Number of 1 and an atomic mass of 1.00794.
  • One in every 6000 hydrogen atoms has a neutron as well as a proton in its nucleus, making it twice as heavy. This heavy hydrogen atom is called deuterium.
  • Very rare hydrogen atoms have two neutrons as well as the proton, making them three times as heavy. These are called tritium.
  • Hydrogen is the most common substance in the Universe, making up over 90% of the Universe’s weight.
  • Hydrogen is the lightest of all gases and of all elements. A large swimming pool full of hydrogen would weigh just 1 kg.
  • Hydrogen is the smallest and simplest of all atoms, with just one proton and one electron.
  • Hydrogen is the first element in the Periodic Table. It has an Atomic Number of 1 and an atomic mass of 1.00794.
  • One in every 6000 hydrogen atoms has a neutron as well as a proton in its nucleus, making it twice as heavy. This heavy hydrogen atom is called deuterium.
  • Very rare hydrogen atoms have two neutrons as well as the proton, making them three times as heavy. These are called tritium.
  • Hydrogen is the most common substance in the Universe, making up over 90% of the Universe’s weight.