Oxygen, a chemicalelement v the symbol P and atomic number 15, is a very reactive nonmetaland a very good oxidizing agent which readily develops oxides which many ofelements as well as compounds. At standard temperature and pressure, two oxygenatoms bind to type colorless, odorless diatomic dioxygen gas i beg your pardon constitutes21% of the earth"s surface.

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O2 gas providescombustion energy throughout light and fire. It has actually a very big biological duty inall life organisms in the kind of aerobic cellular respiration and plays a significant role in photosynthesis also. The an easy formula for photosynthesis isgiven below:

6 CO2 (Carbon dioxide)+ 6 H2O (water) + photons (sunlight)→C6H12O6(glucose) + O2 (dioxygen)

You are here toknow valence electron of an oxygen atom, aren’t you? Don’t worry along with oxygenvalence electrons we will explain its valency also. But prior to that let’s havesome basic ideas around what these 2 terms are:

Difference BetweenValence Electrons and Valency

Valence electronsare the total variety of electrons existing in the outermost shell of one atom(i.e. In outermost orbital). The valence electrons because that a neutral atom arealways definite, it cannot be varied (more or less) in any kind of condition because that aparticular atom and may or may not be equal to its valency.


Valency is definedas the total number of electrons an atom have the right to lose, gain, or share in ~ the timeof bond formation to obtain a stable electronic configuration i.e. To finish anoctet. The valency of an atom have the right to be variable in different compounds orchemical reactions as result of the different bonding circumstances. Many of the timevalency varies/changes early out to adjust in oxidation and reduction states.

Oxygen (O) ValenceElectrons

There space foursimple measures to find out the valence electrons because that oxygen atom i beg your pardon are:

Step 1: find theAtomic Number


To uncover out theatomic variety of oxygen, we deserve to use the periodic table. V the aid of theperiodic table, us can quickly see that the atomic number of oxygen is 8. As itsatomic number is 8, it has 8 protons, and also for neutral oxygen, the number ofprotons are constantly equal come the number of electrons i.e. Has 8 electron in itsnucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the arrangement of electron on the orbitals. The oxygen atomhas a full of 8 electrons so, we have to put 8 electron in orbitals. Theelectrons will be inserted in different orbitals according to the energy level:<1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f>. Now,

Oxygen electronconfiguration O (8) =1s22s22p4(completeconfiguration).

= 2s²2p⁴(condensed configuration).

Step 3: DetermineValence Shell

As us know, thevalence shell of an atom have the right to be uncovered from the highest number of principlequantum number which space expressed in the hatchet of n, and also in 2s²2p⁴, thehighest worth of n is 2 so the the valence shell of oxygen is2s²2p⁴.

Step 4: FindValence Electrons

The complete number ofelectrons current in the valence covering of an atom are called valence electrons,and there space a full of 6 electrons present in the valence covering of oxygen (2s²2p⁴).Thus,oxygen has actually six valence electrons.

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Valency that Oxygen (O)

There space manydifferent means to find out the valency of one atom which mirrors the capacity ofan atom come bond with other atoms. Valence defines how quickly an atom or afree radical can integrate with various other chemical species. The valency of an atom isdetermined based on the number of electrons lost, gained, or mutual withanother atom at the time of shortcut formation.

An atom is stated tobe stable once its outermost shells have eight electron (except H & He).If the total number of electrons in outermost shells is between one to four,the atom has positive valency and also if electrons are in between four to eight, thevalency is calculate by subtracting from eight and valency will certainly be zero. Atomshaving four outermost electrons own both confident and an adverse valency, andatoms having eight outermost electrons, valency will be zero (i.e. Noblegases).

Elements prefer oxygencan with the stable state (nearest inert gas configuration: Ne) by acquiring 2electrons.So the the valency the oxygen is 2.

Mathematically, theelectronic construction of oxygen is 2, 6. And also as us know, if electron inoutermost shell exceeds native 4, it need to be subtracted from 8.

ElectronConfiguration that oxygen (O) = 2, 6

We can see the outermost shell of oxygen has 6 electron so, have to subtract the from 8.

8 – 6 = 2

That’s why valencyof oxygen is 2.

Note: In general, oxygenhas a steady oxidation state of -2 in many of the compounds but it may vary insome compounds as result of the different bond stability. Perform not confuse v -2, itis just an oxidation number that deserve to vary from compound to compound. But its valencyis 2 just in any type of case.

In another sense, anoxygen atom can type a preferably of 2 covalent bond in chemistry bonding (For example:CO2, H2O, etc.), and also that what valency is, the maximum ability to form bondswith atom at the time of chemistry reactions.

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We can additionally findthe valency that oxygen v the help of the routine table. As oxygen belong togroup 16 (6A or VIA) along with sulfur (S), arsenic (As), and selenium (Se), tellurium(Te), polonium (Po), and livermorium (Lv). These group facets are additionally called chalcogens.All these elements have a valency that 2.