Neptunium

• Neptunium is a chemical element with the Symbol Np, Atomic number 93, Electron configuration [Rn] 5f4 6d1 7s2,Atomic number 93, Atomic mass 237 u.
• Neptunium lies in Row 7 of the periodic table.
• Elements in Row 7 are also called actinide elements.
• Neptunium is a silvery radioactive synthetic metal.
• Neptunium is melting point of 640°C (1,180°F) and a density of 20.45 grams per cubic centimeter.