Oxygen (O) Orbital diagram, Electron configuration, and Valence electrons

The electron configuration of Oxygen can be found using the Aufbau principle.

Aufbau Principle:

• The word ‘Aufbau’ in German means ‘building up’.
• The Aufbau rule simply gives the order of electrons filling in the orbital of an atom in its ground state.
• It states that the orbital with the lowest energy level will be filled first before those with high energy levels. In short, the electrons will be filled in the orbital in order of their increasing energies.
• For example, the 1s orbital will be filled first with electrons before the 2s orbital.

Simply understand that there are commonly four different types of subshells – s, p, d, and, f.

These subshells can hold a maximum number of electrons on the basis of a formula, 2(2l + 1) where ‘l’ is the azimuthal quantum number.

Value of ‘l’ for different subshells.

Subshells	Value of ‘l’	Maximum number of electrons, 2(2l + 1)	Number of orbitals in the subshell
s	0	2	1
p	1	6	3
d	2	10	5
f	3	14	7

So, in short, the s subshell can hold a maximum of 2 electrons(1 orbital), the p subshell can hold 6 electrons(3 orbitals), the d subshell can hold 10 electrons(5 orbitals), and the f subshell can hold at most 14 electrons(7 orbitals).

Now, the electron configuration of an atom can be built by filling the electrons in a lower energy subshell first then higher, higher, and higher.

Generally, (n + l) rule is used to predict the energy level of subshells.

n = principle quantum number

l = Azimuthal quantum number

⇒ Lower the value of (n + l) for an subshell, the lower its energy, hence, it will be filled first with electrons.

⇒ For two different subshells having same (n + l) value, then the subshell with lower value of n has lower energy.

So, all these are basics of How filling of electrons will be done in different subshells, obviously, you don’t have so much time for writing electron configuration by using so many rules.

Therefore, we have a diagonal rule for electron filling order in the different subshells using the Aufbau principle.

So, the order in which the orbitals are filled with electrons from lower energy to higher energy is – 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 7p and so on.

Oxygen Electron configuration using the Aufbau Principle

• An oxygen atom is a neutral atom that has 8 atomic numbers which imply it has a total of 8 electrons.
• As per the Aufbau rule, the electrons will be filled into 1s orbital first then 2s, then 2p…so on.
• Now, for the electron configuration of Oxygen, the first 2 electrons will go in 1s orbital since s subshell can hold a maximum of 2 electrons.
• The next two electrons will go in the 2s orbital, after that, we are left with 4 electrons, these will go in the 2p orbital since the p subshell can hold a maximum of 6 electrons.
• Therefore, the electron configuration of Oxygen will be 1s²2s²2p⁴.

Oxygen (O) Electron Configuration

Check – Electron configuration calculator to count the electron configuration for any atom

Orbital diagram for Oxygen

The orbital diagram simply represents the arrangement of electrons in the different orbitals of an atom, it uses an arrow to represent the electrons, every orbital(one box) contains a maximum of 2 electrons.

There are three rules followed for constructing the orbital diagram for an atom.

(1). Aufbau’s principle:- This rule state that the lower energy orbital will be filled before the higher energy orbital, for example – the 1s orbital will fill before the 2s orbital.

(2). Hund’s rule:- This rule state that each orbital of a given subshell should be filled with one electron each before pairing them. That means “Each orbital gets one electron first, before adding the second electron to the orbital”.

(3). Pauli Exclusion Principle:- This rule state that, no two electrons can occupy the same orbital with the same spin. That means “One must be spin up (↑) and one must be spin down (↓)”.

If you understand the above rules then constructing the orbital diagram or orbital notation for Oxygen is super easy.

Basics of Orbital diagram:-

There are different types of orbitals – s, p, d, and, f. These orbitals contain a number of boxes that can hold a number of electrons. Let’s see.

Each box will hold a maximum of 2 electrons with opposite spin.

• S orbital contains 1 box that can hold a maximum of 2 electrons.
• P orbital contains 3 boxes that can hold a maximum of 6 electrons.
• D orbital contains 5 boxes that can hold a maximum of 10 electrons.
• F orbital contains 7 boxes that can hold a maximum of 14 electrons.

The orbital diagram will also be filled with the same order as described by the Aufbau principle. (1s < 2s < 2p < 3s……and so on.)

Also check –

• Orbital diagram calculator
• Orbital diagram for all elements in the periodic table

What is the Orbital diagram for Oxygen?

We know the electron configuration of Oxygen is 1s²2s²2p⁴, now for drawing its orbital diagram, we need to show its electrons in form of an arrow in different boxes using Hund’s and Pauli exclusion rule.

• The orbital diagram of Oxygen contains 1s orbital, 2s orbital, and 2p orbital. 1s orbital contains 1 box, 2s orbital also contains 1 box and 2p orbital contains 3 boxes.
• Oxygen has a total of 8 electrons and one box can hold up to the two electrons.
• Therefore, the first two electrons will go in the 1s orbital, and the next two will go in the 2s orbital, now we are left with 4 electrons.
• These 4 electrons will go in the 2p orbital, since, the 2p orbital has 3 boxes, so, these electrons will be filled using Hund’s rule. (Each box gets one electron first, then start pairing).

Oxygen Orbital diagram

Electron configuration Vs Orbital diagram for Oxygen

The main difference between the orbital diagram and electron configuration is an orbital diagram shows electrons in form of arrows whereas an electron configuration shows electrons in form of numbers. Also, the orbital diagram shows details on the spin of electrons whereas the electron configuration doesn’t show it.

Both these follow the Aufbau principle (Diagonal rule).

Also Read:–

• How to write the Electron configuration for any elements?
• How to draw the Orbital diagram for an atom?

Electron configuration for Oxygen via Bohr model (Orbit)

Bohr model describes the visual representation of orbiting electrons around the small nucleus. It used different electron shells such as K, L, M, N…so on.

These electron shells hold a specific number of electrons that can be calculated via the 2n² formula where n represents the shell number.

Electron shells	Shell number (n)	Max. number of electrons (2n2)
K	1	2
L	2	8
M	3	18
N	4	32

So, K is the first shell or orbit that can hold up to 2 electrons, L is the 2nd shell which can hold up to 8 electrons, M is the third shell that can hold up to 18 electrons, and N is the fourth shell that can hold up to 32 electrons.

Now, Oxygen has an atomic number of 8 and it contains a total number of 8 electrons. Hence, 2 electrons will go in the first shell(K) and 6 electrons will go in the second shell(L).

Therefore, the electrons per shell for Oxygen is 2, 6, hence, we can say, based on the shell, the electronic configuration of the Oxygen atom is [2, 6].

Also check – How to draw Bohr model of Oxygen atom

Oxygen Valence electrons

Valence electrons are the outermost electrons present in the outermost shell of an atom. They have more energy, hence, they are part of most chemical reactions.

We can find valence electrons of an atom either by knowing its periodic group number or its electron configuration. Both these ways are super easy.

Finding Oxygen Valence electrons through the Group number

For neutral atoms, the valence electrons of an atom will be equal to its main periodic group number. However, for transition metals, the process of finding valence electrons is complicated.

Now, for determining the valence electron for the Oxygen atom, look at the periodic table and find its Group number. The group number can be found from its column on the periodic table.

So, the number of valence electrons in Oxygen is 6. Since it belongs to Group 16 (also called 6A) in the Periodic table.

Finding Oxygen Valence electrons through the Electron configuration or Bohr model

We know, the electron configuration of the Oxygen atom is 1s²2s²2p⁴, and valence electrons are those electrons found in the outer shell of an atom.

This electron configuration of Oxygen shows that the outer shell of oxygen has 6 electrons(2s²2p⁴), hence, the number of valence electrons in the Oxygen atom is 6.

Also, we know, that the electron configuration of Oxygen-based on the shells is [2, 6], which means, that two electrons are present in the first shell, and six electrons are present in 2nd shell or outer shell.

Hence, the electrons found in the 2nd shell of the Oxygen atom are its valence electrons because it is the outermost shell also called the valence shell.

The 2nd shell or outer shell of the Oxygen atom contains 6 electrons, therefore, the number of valence electrons in the Oxygen atom is 6.

Check – Valence electron calculator to calculate the number of valence electrons for any atom

Electron configuration, Valence electrons, and Orbital diagram of Oxygen in tabular form

Name of atom	Oxygen (O)
Number of electrons	8
Number of electrons per shell	[2, 6]
Number of valence electrons	6
Electron configuration	1s22s22p4 or [He] 2s22p4
Orbital diagram	Consists of three orbitals – 1s, 2s, and, 2p

Also Read:

• Nitrogen orbital diagram and electron configuration
• Carbon orbital diagram and electron configuration
• Fluorine orbital diagram and electron configuration
• Neon orbital diagram and electron configuration
• Boron orbital diagram and electron configuration
• Sodium orbital diagram and electron configuration
• Magnesium orbital diagram and electron configuration
• Aluminum orbital diagram and electron configuration
• Silicon orbital diagram and electron configuration
• Phosphorous orbital diagram and electron configuration
• Sulfur orbital diagram and electron configuration
• Chlorine orbital diagram and electron configuration
• Argon orbital diagram and electron configuration
• Potassium orbital diagram and electron configuration
• Calcium orbital diagram and electron configuration
• Beryllium orbital diagram and electron configuration
• Lithium orbital diagram and electron configuration

FAQ

What are the Ground state and Excited-state Electron configurations of Oxygen? There is a simple difference between Ground state and Excited-state configuration. The ground state configuration of an atom is the same as its regular electron configuration in which electrons remain in the lowest possible energy. So, the ground-state electron configuration for the Oxygen atom is 1s22s22p4. The excited-state configuration of an atom is different from the regular configuration of an atom, this occurs, when an electron is excited and jumps into a higher orbital. The excited-state electron configuration for Oxygen is 1s22s22p33s1.

What is the shorthand electron configuration of Oxygen? The shorthand electron configuration for oxygen atom is [He] 2s22p4. ∴ [He] electron configuration is 1s2.

Which element has the 1s22s22p4 Electron configuration? Element with electron configuration 1s22s22p4 is Oxygen (O) which has the atomic number of 8.

How many valence electrons does Oxygen have? The Oxygen atom has 6 valence electrons in its outermost or valence shell. Oxygen is belonged to group 16th and has the atomic number of 8.

What is the orbital diagram for Oxygen (O)? The orbital diagram for Oxygen is drawn with 3 orbitals. The orbitals are 1s, 2s, and 2p. The Oxygen orbital diagram contains 2 electrons in the 1s orbital, 2 electrons in the 2s orbital, and the rest four electrons in the 2p orbital. An orbital diagram for a ground-state electron configuration of Oxygen atom is shown below-

What is the electron configuration of the O2- ion? We know, in general, that the electron configuration of Oxygen (O) is 1s22s22p4. Now, in O2- ion, the negative charge means, oxygen has gained two extra electrons. Therefore, to write the electron configuration of O2- ion, we have to add two electrons to the configuration of Oxygen (O). ∴ The resulting electron configuration for Oxide ion (O2-) will be 1s22s22p6. It resembles the configuration of the nearest inert gas i.e Neon.

Properties and Uses of Oxygen

• It is a highly reactive nonmetal and oxidizing agent in nature.
• It is the third-most abundant element in the universe, the first is hydrogen and the second is helium.
• It appears colorless in gas form and pale blue in solid and liquid form.
• It belongs to period 2, p-block, and group 16 (chalcogens).
• Its electronegativity is 3.44 and its oxidation state varies from -2 to +2.
• It has a cubic crystal structure.
• It is paramagnetic in nature.
• It is used in rocket propellants, submarines, aircraft, etc.
• It is used in the production of plastics, steel, and textiles.
• It is used in the medical industry to provide oxygen therapy.
• It is also used to remove excess carbon and sulfur impurities from molten iron.

Production and reactions for Oxygen

Free oxygen is simply produced by the photosynthesis reaction.

⇒ carbon dioxide + water + sunlight → glucose + dioxygen

When oxygen reacts with metal, it forms metal oxide.

⇒ metal + oxygen → metal oxide

⇒ 2Mg + O₂ → 2MgO

⇒ 2Cu + O₂ → 2CuO

The reaction of oxygen with hydrogen forms a water molecule.

⇒ 2H₂ + O₂ → 2H₂O

Summary

• The electron configuration of Oxygen in terms of the shell or orbit is [2, 6].
• The ground-state electron configuration of the Oxygen (O) atom is 1s²2s²2p⁴. And for the excited state, it is 1s²2s²2p³3s¹.
• The shorthand electron configuration for Oxygen is [He] 2s²2p⁴.
• The electron configuration for the Oxide ion (O^2-) is 1s²2s²2p⁶.
• The number of valence electrons available for Oxygen atoms is 6. Oxygen is situated in Group 16th and has an atomic number of 8.
• The first shell of Oxygen has 2 electrons and the outer shell or valence shell of oxygen has 6 electrons, hence, the number of valence electrons in the Oxygen atom is 6.
• The orbital diagram for Oxygen is drawn by following three principles – the Aufbau principle, Hund’s principle, and Pauli’s exclusion principle.
• The Oxygen orbital diagram comprises three orbitals. The three orbitals are 1s, 2s, and 2p.
• The first two electrons will go in the 1s orbital, the next two in the 2s orbital, and the last four in the 2p orbital.