Questions about the 4th state of matter, namely a mixture of particles like ions, free electrons and usually also neutral atoms or molecules.

With rising temperature, substances move from being solid to liquid and then to being in the gaseous statem, and finally to plasma. A plasma is therefore also called the "fourth aggregate state of matter". The atoms of the gas split off electrons and remain as charged particles. 99% of matter in the universe exists in this aggregate state, because all stars consist of plasma.

Further reading