Periodic classification

• Elements 1 to 30

  • Hydrogen
  • Helium
  • Lithium
  • Beryllium
  • Boron
  • Carbon
  • Nitrogen
  • Oxygen
  • Fluorine
  • Neon
  • Sodium
  • Magnesium
  • Aluminium
  • Silicon
  • Phosphorus
  • Sulfur
  • Chlorine
  • Argon
  • Potassium
  • Calcium
  • Scandium
  • Titanium
  • Vanadium
  • Chromium
  • Manganese
  • Iron
  • Cobalt
  • Nickel
  • Copper
  • Zinc
• Element symbol


  Element name
• Atomic number


  Atomic weight
• Hydrogen is element number 1
• Helium is element number 2
• Lithium is element number 3
• Beryllium is element number 4
• Boron is element number 5
• Carbon is element number 6
• Nitrogen is element number 7
• Oxygen is element number 8
• Fluorine is element number 9
• Neon is element number 10
• Sodium is element number 11
• Magnesium is element number 12
• Aluminium is element number 13
• Silicon is element number 14
• Phosphorus is element number 15
• Sulfur is element number 16
• Chlorine is element number 17
• Argon is element number 18
• Potassium is element number 19
• Calcium is element number 20
• Scandium is element number 21
• Titanium is element number 22
• Vanadium is element number 23
• Chromium is element number 24
• Manganese is element number 25
• Iron is element number 26
• Cobalt is element number 27
• Nickel is element number 28
• Copper is element number 29
• Zinc is element number 30
• Most abundant elements


  • Nitrogen (18%)
  • Oxygen (22%)
  • Silicon
  • Aluminium
  • Oxygen
• Mercury, Gallium and Cesium are liquid metals at room temperature
• Barium is a liquid non-metal at room temperature
• Technetium is a fast man-made element
• Iridium has the highest density of any element
• Noble gases


  • Hydrogen
  • Helium
  • Nitrogen
  • Oxygen
  • Fluorine
  • Neon
  • Argon
  • Krypton
  • Xenon
  • Radon
• 118 elements are known, with some recently discovered elements being synthetic