Under normal condition-it's gas
No.
it is named for the number of oxygen atoms in the ion and/or oxidation state of the atom to which the oxygen is bonded.
Solid
Liquid.
Solid is the only state of matter with its own shape
oxygen and hydrogen are a type of matter called gas
All matter exists as either a solid, liquid, gas or plasma. This is called it's 'State Of Matter'. Oxygen exists as a gas.
At STP it is a gas
Ga
Oxygen is a gas at room temperature.
gas liquid and solid
Oxygen can be liquid or a gas. It is just a different state of matter.
No, a gas is a state of matter. oxygen can be found in either liquid or gaseous states
Just as in all the other answers to this question, it is normally a gas. It can be liquefied .
Matter can be broadly categorized into solid, liquid or gaseous state, what is it that makes the matter remain in one of these state, this animated science topic gives in-depth information about states of matter.
What i can say is that it is invisible
No. A vacuum is a point in space where there is literally nothing - no dust/oxygen/water particles. Ie. it contains absolutely no matter whatsoever, and therefore by definition, is not a state of matter.