[Lazamataz]

Iron cannot in a normal state, be in gaseous form or any other form but a solid.

All elements can exist in a plasma state.

[RightWhale]

All elements can exist in a plasma state.

They cease to be elements when they lose all their electrons. Easy enugh for hydrogen. They are just undefined pieces of nuclear material fusing and fissioning freely and happily. There is no chemical reaction then, so no chemical elements. It's just plasma. Ions is an inbetween state where you can get the elements back again with ordinary electrical interactions. Right, plasma is a fourth state of matter, no elements.

[Cold Heat]

All elements can exist in a plasma state.

And once converted to plasma, they really are broken down to ions/electrons, are they not? They cannot be converted back to their normal state as a pure element once they have converted, and can no longer be called anything but plasma, if my brain is working correctly this morning.