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In wa­ter and in a hy­dro­ni­um ion, the ox­i­da­tion state of oxy­gen is also two. Alkali metals (except hydrogen) remove one electron to form +1 ion. We may pro­vide many ex­am­ples of such com­pounds among salts, acids, ox­ides and bases: KClO₄, H₂­SO₄, N₂O₃, NaOH etc. As this non-met­al is a strong ox­i­diz­er, it fre­quent­ly dis­plays this ox­i­da­tion state in com­pounds. The oxidation number describes explicitly the degree to which an element can be oxidized (lose electrons) or reduced(gain electrons). The low­est ox­i­da­tion state of oxy­gen is -2. Oxy­gen is ca­pa­ble of dis­play­ing sev­er­al ox­i­da­tion states in chem­i­cal re­ac­tions: -2, -1, 0, +2. 1 Comparing Sublevels of the Groups SG 6 chemistry oxidation numbers and. Oxy­gen is a strong ox­i­diz­er (only flu­o­rine dis­plays stronger ox­i­da­tion prop­er­ties be­cause of its greater elec­tri­cal neg­a­tive­ly and its more pro­nounced non-metal­lic prop­er­ties (by its po­si­tion in the pe­ri­od­ic ta­ble)). This element is found in group 15 and period 2 of the Periodic Table of the. In its compounds, chromium is found in the +2, +3, and +6 oxidation states, with the +3 oxidation state being the most stable and the most common. The elements are arranged in an ascending order of their atomic numbers forming a table of 18 vertical columns and 7 horizontal periods, To indicate the type of the element: S, P except zero-group is a representative element or main group element, zero group is a noble gas, d is the main transition element, and f is the inner transition element. It is en­coun­tered in the form of 3 iso­topes – in na­ture, oxy­gen with the atom­ic num­bers of 16, 17 and 18 is en­coun­tered. The elements are arranged in seven horizontal rows. The periodic table, also known as the periodic table of the (chemical) elements, is a tabular display of the chemical elements.It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry. Each box represents an element and contains its atomic number, symbol, average atomic mass, and (sometimes) name. It sup­ports breath­ing, com­bus­tion and de­com­po­si­tion. A modern periodic table arranges the elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column ( Figure 2.26 ). All alkaline earth elements have an oxidation number of. Oxy­gen is a di­atom­ic col­or­less gas with­out smell or taste. The alkaline earth elements are metallic elements found in the second group of the periodic table.

It is a rep­re­sen­ta­tive of the chalco­gens group (they also in­clude sul­fur, se­le­ni­um, tel­luri­um and polo­ni­um).

Oxy­gen is an el­e­ment of the 6ᵗʰ group (un­der the new clas­si­fi­ca­tion the 16ᵗʰ group) of the main sub­group of the pe­ri­od­ic ta­ble.