Here you can read more about the chemical element Neptunium. Its shemical symbol is Np and its atomic number is 93. The relative atomic mass of Neptunium is 237 u. The elemental classification of Neptunium is Actinides, and it belongs to group 3 and period 7 in the Periodic Table of Elements.
The density of Neptunium is 20250 kg/m3. The melting point of Neptunium is 913 Kelvin (640 ℃). The boiling point of Neptunium is 4175 Kelvin (3902 ℃). Neptunium was discovered in the year 1940 by Edwin McMillan and Philip H. Abelson.
To the right (or below if you are using a mobile device with a smaller screen) you will find the information given above for the element Neptunium ordered in tabular form, which might be easier to read and use if you want to quantify it in some sort.