Oxygen, a chemicalelement v the symbol P and atomic number 15, is a highly reactive nonmetaland a very good oxidizing agent which readily creates oxides which most ofelements as well as compounds. At typical temperature and also pressure, two oxygenatoms bind to kind colorless, odorless diatomic dioxygen gas which constitutes21% of the earth"s surface.

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O2 gas providescombustion energy during light and fire. It has actually a very big biological role inall living organisms in the kind of aerobic moving respiration and also plays a major role in photosynthesis also. The an easy formula because that photosynthesis isgiven below:

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

You are here toknow valence electrons of one oxygen atom, aren’t you? Don’t worry along with oxygenvalence electrons us will define its valency also. But before that let’s havesome an easy ideas about what these two terms are:

Difference BetweenValence Electrons and also Valency

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


Valency is definedas the total variety of electrons an atom can lose, gain, or share at the timeof bond development to acquire a stable digital configuration i.e. To complete anoctet. The valency of an atom can be change in different compounds orchemical reactions because of the various bonding circumstances. Many of the timevalency varies/changes early to readjust in oxidation and also reduction states.

Oxygen (O) ValenceElectrons

There are foursimple measures to find out the valence electrons for oxygen atom which are:

Step 1: discover theAtomic Number


To find out theatomic variety of oxygen, we deserve to use the routine table. Through the aid of theperiodic table, us can quickly see that the atomic variety of oxygen is 8. Together 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 electrons in itsnucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the setup of electron on the orbitals. The oxygen atomhas a full of 8 electrons so, we have to put 8 electrons in orbitals. Theelectrons will certainly be placed in different 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 us know, thevalence covering of an atom deserve to be discovered from the highest number of principlequantum number which space expressed in the term of n, and in 2s²2p⁴, thehighest value of n is 2 so that the valence covering of oxygen is2s²2p⁴.

Step 4: FindValence Electrons

The complete number ofelectrons current in the valence shell of an atom are referred to as valence electrons,and there space a complete of six electrons existing in the valence covering of oxygen (2s²2p⁴).Thus,oxygen has six valence electrons.

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Valency of Oxygen (O)

There space manydifferent methods to discover out the valency of one atom which shows the ability ofan atom to bond with other atoms. Valence describes how quickly an atom or afree radical can incorporate with various other chemical species. The valency of an atom isdetermined based upon the number of electrons lost, gained, or mutual withanother atom at the moment of bond formation.

An atom is said tobe stable once its outermost shells have eight electrons (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 electron are in between four to eight, thevalency is calculate by individually from eight and valency will 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 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 us know, if electron inoutermost shell exceeds native 4, it need to be subtracted native 8.

ElectronConfiguration the oxygen (O) = 2, 6

We deserve to see the outermost covering of oxygen has 6 electron 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 the -2 in many of the compounds but it may vary insome compounds as result of the various bond stability. Carry out not confuse with -2, itis just an oxidation number that can vary from link to compound. But its valencyis 2 just in any case.

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

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We can additionally findthe valency that oxygen with the assist of the routine table. As oxygen belonging togroup 16 (6A or VIA) in addition to sulfur (S), arsenic (As), and also selenium (Se), tellurium(Te), polonium (Po), and livermorium (Lv). These group facets are also called chalcogens.All these aspects have a valency that 2.