Oxygen, a chemicalelement v the prize P and atomic number 15, is a very reactive nonmetaland a very an excellent oxidizing agent which readily forms oxides which most ofelements as well as compounds. At typical temperature and pressure, 2 oxygenatoms tie to form 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 a very big biological function inall life organisms in the kind of aerobic cellular respiration and also plays a major role in photosynthesis also. The simple formula for photosynthesis isgiven below:

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

You are right here toknow valence electrons of one oxygen atom, aren’t you? Don’t worry in addition to oxygenvalence electrons we will describe its valency also. But before that let’s havesome an easy ideas about what these 2 terms are:

Difference BetweenValence Electrons and also Valency

Valence electronsare the total variety of electrons present in the outermost covering of an atom(i.e. In outermost orbital). The valence electrons because that a neutral atom arealways definite, it can not be varied (more or less) in any type of condition because that aparticular atom and also may or may not be equal to its valency.


Valency is definedas the total number of electrons one atom have the right to lose, gain, or share in ~ the timeof bond formation to obtain a stable digital configuration i.e. To finish anoctet. The valency of an atom deserve to be change in various compounds orchemical reactions because of the different bonding circumstances. Many of the timevalency varies/changes due to readjust in oxidation and reduction states.

Oxygen (O) ValenceElectrons

There are foursimple actions to find out the valence electrons because that oxygen atom i m sorry are:

Step 1: find theAtomic Number


To uncover out theatomic number of oxygen, we deserve to use the periodic table. With the assist of theperiodic table, we can quickly see the the atomic variety of oxygen is 8. Together itsatomic number is 8, it has actually 8 protons, and also for neutral oxygen, the number ofprotons are always equal to the number of electrons i.e. Has 8 electrons in itsnucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the setup of electron on the orbitals. The oxygen atomhas a complete of 8 electron so, we have to put 8 electron in orbitals. Theelectrons will certainly be placed in various orbitals according to the power 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 we know, thevalence covering of one atom deserve to be discovered from the highest variety of principlequantum numbers which are expressed in the term of n, and also in 2s²2p⁴, thehighest worth of n is 2 so that the valence covering of oxygen is2s²2p⁴.

Step 4: FindValence Electrons

The total number ofelectrons current in the valence covering of one atom are referred to as valence electrons,and there room a total of 6 electrons present in the valence shell of oxygen (2s²2p⁴).Thus,oxygen has six valence electrons.

Also Read:

Valency of Oxygen (O)

There room manydifferent ways to uncover out the valency of one atom which shows the capability ofan atom come bond with various other atoms. Valence defines how conveniently an atom or afree radical can integrate with other chemical species. The valency of one atom isdetermined based upon the variety of electrons lost, gained, or shared withanother atom at the moment of shortcut formation.

An atom is said tobe stable once its outermost shells have actually eight electron (except H & He).If the total variety of electrons in outermost shells is in between one come four,the atom has positive valency and if electrons are between four come eight, thevalency is calculated by subtracting from eight and also valency will be zero. Atomshaving four outermost electrons possess both optimistic and an unfavorable valency, andatoms having eight outermost electrons, valency will be zero (i.e. Noblegases).

Elements prefer oxygencan reach the secure state (nearest inert gas configuration: Ne) by getting 2electrons.So the the valency of oxygen is 2.

Mathematically, theelectronic construction of oxygen is 2, 6. And also as we know, if electron inoutermost covering exceeds from 4, it have to be subtracted from 8.

ElectronConfiguration the oxygen (O) = 2, 6

We deserve to see the outermost shell of oxygen has actually 6 electrons so, need to subtract the from 8.

8 – 6 = 2

That’s why valencyof oxygen is 2.

Note: In general, oxygenhas a secure oxidation state that -2 in most of the compounds yet it might vary insome compounds because of the various bond stability. Perform not confuse with -2, itis just an oxidation number that have the right to vary from link to compound. But its valencyis 2 only in any type of case.

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

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We can also findthe valency of oxygen through the aid of the periodic table. As oxygen belongs togroup 16 (6A or VIA) along with sulfur (S), arsenic (As), and selenium (Se), tellurium(Te), polonium (Po), and also livermorium (Lv). This group aspects are additionally called chalcogens.All these aspects have a valency the 2.