The Elements Table

The Interactive Periodic Table of Elements

  • 93 Np Neptunium 237.048
  • 93 Np Neptunium 237.048
  • 93 Np Neptunium 237.048
  • Vital Element Stats

  • Name: Neptunium
  • Symbol: Np
  • Weight: 237.048
  • Family: Actinide
  • Group: 93
  • Period: 4175
  • Composition

  • Electrons: 93
  • Protons: 93
  • Neutrons: ~144
  • Measurements

  • Density: 20.20 g/mL
  • Miscellaneous Facts

  • Discovered: 1946
  • Melting Point: 912 o C , 1673.6 o F , 1185.15 o Kelvin
  • Boiling Point: 4175 o C , 7547 o F , 4448.15 o Kelvin
  • Cost: N/A