Is Neptunium a Metal, Nonmetal or Metalloid?
Neptunium (Np) is a metal (an actinide) — an actinide — a radioactive f-block metal of period 7. It sits in the f-block, period 7, and is a solid at room temperature.
Looking for Neptunium's metal or nonmetal without wading through a whole chapter? Here is the direct answer first, then the tables and derivations examiners want to see. Every number on this page comes from the same engine that powers the interactive table. Need the whole picture instead — history, characteristics, uses, exam questions? The full Neptunium page is one click away.
The one-line answer, with reasons
Neptunium is a metal (an actinide). Chemists decide by behaviour, not appearance: metals (like Neptunium) give up electrons, shine when freshly cut, and conduct heat and electricity; nonmetals take or share electrons and (as solids) break rather than bend. Neptunium checks every metal box — placed in the actinide family of the table.
Neptunium's metal/nonmetal report card
| Property | Value | Typical of |
|---|---|---|
| Category | Actinide | — |
| Phase at room temp | solid | metals are usually solid |
| Block | f-block | — |
| Group | f-block | — |
| Period | 7 | — |
The family it belongs to
The whole actinide family shares one seating area of the table, and every member's family ID card is one click away — compare Neptunium with its upstairs or downstairs neighbour and the family pattern jumps out.
Students also ask
Is Neptunium a good conductor of electricity?
Yes — like other metals, Neptunium conducts electricity and heat well, thanks to its sea of free electrons.
Can a gas be a metal — like Neptunium?
Yes — being a metal or nonmetal is about bonding and electron behaviour, not state. At room temperature Neptunium is a solid, and that says nothing against its metallic character.