It is the very unstable gas called ozone.
Ozone
Ozone is formed from oxygen. Oxygen molecules (O2)are broken apart by ultraviolet (UV-C) light from the Sun. This makes two single oxygen atoms, which are very reactive. Most single oxygen atoms recombine directly to for O2 again. Some single oxygen atoms are temporarily stored on nitrogen (N2) molecules, and ozone is formed when this "loose assembly" contacts an oxygen molecule. Some oxygen atoms interact more or less directly with an oxygen molecule to form ozone.
Ozone is a molecule with formula O3. It is bent in shape and has sp and sp2 hybridised oxygen atoms.
A molecule
The ball and stick sketch of CH2O (formaldehyde) illustrates the molecular structure, where carbon (C) is represented by a black ball, bonded to two hydrogen (H) atoms (represented by white balls) and one oxygen (O) atom (represented by a red ball). The carbon atom is at the center, forming two single bonds with the hydrogen atoms and a double bond with the oxygen atom. This arrangement reflects the molecule's planar geometry, with bond angles of approximately 120 degrees. The sketch visually emphasizes the connectivity and spatial arrangement of atoms in the formaldehyde molecule.
O3 is known as trioxygen, or ozone. It is made up of 3 Oxygen atoms bonded together.
Oxygen is an element. The oxygen in our atmosphere typically combines with itself, as does the nitrogen, forming a diatomic molecule--O2. So the two atoms in a molecule of oxygen would both be oxygen atoms.
Oxidation
O2 is a molecule made up of two oxygen atoms. Oxygen itself is an element, but when it combines with another oxygen atom to form O2, it is considered a molecule.
The oxidation reaction is called combustion : the material may burn or explode.
Ozone consists of three oxygen atoms (symbol is O3).
There are 2 oxygen atoms in 1 molecule of oxygen.
ONE oxygen molecule (O2) contains two atoms of oxygen (O).
None. An oxygen molecule contains two oxygen atoms and nothing else.
Linear
Most oxygen molecules are composed of two atoms of oxygen, and we frequently refer to oxygen as O2 (or O2) for this reason. Oxygen can also exist as the molecule called ozone, which is O3. Ozone is unstable, and will revert to O2 in a few minutes.
Two hydrogen atoms and one oxygen atom combine to form one water molecule.