All four states of matter fundamentally differ in relations of electrons and nuclei inside atom and with other atoms and molecules.
Plasma and gas is as different as solid and liquid or liquid and gas.
In plasma, unlike in gas, electrons are completely separated from nuclei. It is unconnected mix of electrons and naked nuclei, while gas is a mix of atoms or molecules keeping their electrons with them. It is fundamental difference that makes gas and plasma to have different fundamental properties. F.e. gasses are good isolators, while plasma is a conductor. Gases consist from electrically neutral molecules, while plasma from separate charged electrons and nuclei. There can't be molecules in plasma, so it interacts with other substances differently than gas made from same substance. And so on.
Absolutely not.
All four states of matter fundamentally differ in relations of electrons and nuclei inside atom and with other atoms and molecules.
Plasma and gas is as different as solid and liquid or liquid and gas.
In plasma, unlike in gas, electrons are completely separated from nuclei. It is unconnected mix of electrons and naked nuclei, while gas is a mix of atoms or molecules keeping their electrons with them. It is fundamental difference that makes gas and plasma to have different fundamental properties. F.e. gasses are good isolators, while plasma is a conductor. Gases consist from electrically neutral molecules, while plasma from separate charged electrons and nuclei. There can't be molecules in plasma, so it interacts with other substances differently than gas made from same substance. And so on.
Yes.
Same.
They all have mass.
You asked, I answered. If you have other questions, or want say something, you are welcome.
But please be specific and clear, so nobody have to guess what you mean.