its a solid.
At standard pressure and temperature it is a solid.
The state of carbon at standard room temperature and pressure is solid.
At room temperature and pressure it is in liquid state. Its melting point is 280 K under standard pressure.
At room temperature and pressure radium is a solid metal.
Beryllium is a solid metal at room temperature.
Arsenic is a solid at standard temperature and pressure (STP), which is defined as 0 degrees Celsius and 1 atmosphere of pressure.
Krypton is a gas at standard room temperature and pressure.
At standard temperature and pressure, chlorine will be a gas.
gas
All of the substances listed in the question are gases at standard temperature and pressure.
Steel is not an element it is a metallic alloy containing iron, carbon and other additives. At standard temperature and pressure it is a solid.
Aluminum's standard state is solid at room temperature and pressure.