Neptunium
Atomic symbol: Np
Atomic number: 93
Atomic mass: 237
Appearance: Silvery metallic solid at 25°C
Group: N/A
Period: 7
Series: Actinides
Block: f
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f⁴ 6d¹ 7s²
First produced by bombarding uranium-238 with neutrons.
A synthetic, radioactive metal.
Fun Fact! Named after the planet Neptune, not because its’ discovery coincided with the planet’s like with uranium, but to follow on the naming trend after uranium. This trend continued with element 94, plutonium.
