solid is the standard
Uranium238
The standard state of magnesium is solid.
Standard State ( STP / Standard Temperature and Pressure) is 25 o C and 760 mmHg For hydrogen in these considtions it is a GAS.
The chemical symbol for lead in its standard state is Pb.
Aluminum's standard state is solid at room temperature and pressure.
The standard state for nitrogen is a gas at 25 degrees Celsius and 1 atmosphere pressure.
The standard state of iron is solid, but it can be melted into a liquid.
Chlorine's standard state is a gas at room temperature and pressure. It exists as diatomic molecules (Cl2).
gas
solid
The standard heat of formation of a free element in its standard state is defined as zero. This is because it is the reference point from which the heat of formation of other compounds is determined.
Like all metals except for mercury thorium's standard state is solid.