Neptunium is a solid metal.
At room temperature neptunium is a solid metal.
Neptunium is a solid metal at room temperature.
Neptunium is a solid metal at room temperature.
Neptunium is a metal element. It is a solid in room temperature. It is in the f block of the Periodic Table.
Neptunium is a solid metal at room temperature, but undergoes beta decay becoming plutonium within a few days.
At room temperature neptunium is a solid metal.
Hydrogen's physical state at room temperature is a gas.
It is a solid at room temperature.
The actinides are a group of elements. What state of matter they're in depends on which particular one you're talking about and what the temperature is, though in cases where the temperature is one that a human could reasonably expect to survive "solid" is an extremely good guess.
physical
Magnesium is a solid at room temperature.
At room temperature krypton is a gas.