Oxygen, a chemicalelement through the symbol P and atomic number 15, is a extremely reactive nonmetaland a very good oxidizing certified dealer which readily develops oxides which most ofelements as well as compounds. At typical temperature and also pressure, 2 oxygenatoms tie to kind colorless, odorless diatomic dioxygen gas i beg your pardon constitutes21% the the earth"s surface.

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O2 gas providescombustion energy during light and also fire. It has actually a very huge biological duty inall life organisms in the form of aerobic moving respiration and plays a significant role in photosynthesis also. The basic formula for photosynthesis isgiven below:

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

You are below toknow valence electron of one oxygen atom, aren’t you? Don’t worry along with oxygenvalence electrons us will define its valency also. But prior to that let’s havesome simple ideas about what these 2 terms are:

Difference BetweenValence Electrons and also Valency

Valence electronsare the total number of electrons current in the outermost shell of an 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 type of condition because that aparticular atom and may or may not be equal to its valency.


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Valency is definedas the total variety of electrons one atom can lose, gain, or share in ~ the timeof bond formation to gain a stable electronic configuration i.e. To complete anoctet. The valency of an atom can be variable in different compounds orchemical reactions as result of the various bonding circumstances. Most of the timevalency varies/changes due to change in oxidation and reduction states.

Oxygen (O) ValenceElectrons

There are foursimple procedures to discover out the valence electrons for oxygen atom which are:

Step 1: find theAtomic Number


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

Step 2: WriteElectron Configuration


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Electronconfiguration is the setup of electrons on the orbitals. The oxygen atomhas a full of 8 electron so, we need to put 8 electron in orbitals. Theelectrons will be inserted in different orbitals follow 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 we know, thevalence covering of one atom deserve to be discovered from the highest variety of principlequantum number which are expressed in the term of n, and in 2s²2p⁴, thehighest worth of n is 2 so the the valence covering of oxygen is2s²2p⁴.

Step 4: FindValence Electrons

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

Also Read:

Valency that Oxygen (O)

There room manydifferent ways to find out the valency of an atom which shows the capability ofan atom to bond with various other atoms. Valence explains how conveniently an atom or afree radical can integrate with other chemical species. The valency of an atom isdetermined based on the variety of electrons lost, gained, or shared withanother atom at the time of bond formation.

An atom is claimed tobe stable once its outermost shells have eight electrons (except H & He).If the total number of electrons in outermost shells is in between one come four,the atom has actually positive valency and also if electrons are in between four to eight, thevalency is calculate by individually from eight and also valency will be zero. Atomshaving 4 outermost electrons possess both hopeful and an unfavorable valency, andatoms having eight outermost electrons, valency will certainly be zero (i.e. Noblegases).

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

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

ElectronConfiguration the oxygen (O) = 2, 6

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

8 – 6 = 2

That’s why valencyof oxygen is 2.

Note: In general, oxygenhas a steady oxidation state that -2 in many of the compounds but it might vary insome compounds because of the different bond stability. Do not confuse with -2, itis just an oxidation number that can vary from link to compound. Yet its valencyis 2 just in any kind of case.

In one more sense, anoxygen atom can type a preferably of 2 covalent bonds in chemical bonding (For example:CO2, H2O, etc.), and also that what valency is, the maximum capability to kind bondswith atom at the moment of chemical reactions.

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