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oxonium ion (H3O+)
ion m d'oxonium

Axonium ion. The loss of an electron by a hydrogen atom leads to the formation of a hydrogen ion, which is a proton.

The proton is a very small particle and is so reactive that it forms aqueous bonds with water molecules in aqueous solution. These bonds may involve more than one water molecule, but we show only one for simplicity.

H → H+ + e-
H+.....O → H, H

(aqueous) +H3O

It can be used in ion equations in place of H
(watery):

H3O+ (aqueous) + OH- 2 (aqueous) → 2H2O (liquid)

Alkali - acid

oxygen(O2)
oxygen m

Oxygen. A gaseous, non-metallic element in Group VI of the periodic table, constituting 21 percent of the atmosphere. It is a powerful oxidizing agent, vital for plant and animal respiration.
Oxygen is a reactive gas that immediately forms oxides with most elements. It is obtained industrially by fractional distillation of liquefied air, and in the laboratory by the dissociation of hydrogen peroxide:

2H2O2 (aqueous) → 2H2O (liquid) + O2 (gas)

A catalyst such as manganese oxide (IV) is usually used.

Oxygen is a diatomic gas that has no color or smell. It is neutral and only slightly soluble in water (40 cm per cubic decimetre), but this is enough to allow fish and other aquatic organisms to live in the water. Problems arise when the oxygen level in the water drops too low, because the fish suffocate and die. Such a decrease in oxygen concentration is usually caused by pollution. The chemical test for oxygen boils down to inserting a glowing wooden stick (without a flame) into the gas. If the gas is oxygen, the stick ignites again. Oxygen causes anything burning in the air to burn more intensely.

The stick is burning again

Oxygen is used extensively in the steel industry and welding, as a rocket propellant alongside kerosene or hydrogen, and in subsistence systems in medicine or in medicine.
Respirators.

ozone (03)
ozone m

Ozone. Allotrope of oxygen where the triatomic molecule is 0 (gas). It is a blue gas, and a very strong and toxic oxidizing agent. Ozone occupies a very small area of ​​the atmosphere and is mainly found at an altitude of about 30 kilometers above the Earth’s surface in what is called the ozone layer. This layer prevents most ultraviolet radiation from reaching the Earth where it can cause significant damage. Ozone can be formed from oxygen
By passing a spark through it:

3O2 (gas) → 2O3 (gas)

Ozone is a powerful germicide and its great oxidizing power makes it useful, in great dilution, in ventilating places to which access to fresh air is limited, such as underground train tracks.