# Helium electron configuration with Full Orbital Diagram

Helium electron configuration is 1s2. The electron configuration of helium shows that period of helium is 1. The valency and valence electrons of helium are 1. Helium is an inert element.

This article gives an idea about the electron configuration of helium, the period and groups of helium, the valency and valence electrons of helium, application of different principles.

The electron configuration is very important for arranging the periodic table in an accurate and orderly manner. All the elements in the periodic table have specific electron configurations. The electron configuration of each atom can be arranged in two ways.

1. Electron configuration via orbit
2. Electron arrangement via orbital

## Helium Electron Configuration through orbit

Scientist Niels Bohr provided a model of the atom in 1913. The complete idea of the orbit is given there. The electrons of the atom revolve around the nucleus in a certain circular path. These circular paths are called orbit. These orbits are expressed by n. [n = 1,2 3 4. . .]

K is the name of the first orbit, L is the second, M is the third, N is the name of the fourth orbit. The electron holding capacity of each orbit is 2n2. [Where, n = 1,2 3,4 . . .]

Now,
n = 1 for K orbit.
The electron holding capacity of K orbit is 2n2 = 2×12 = 2 electrons.

For L orbit, n = 2.
The electron holding capacity of the L orbit is 2n2 = 2×22 = 8 electrons.

The atomic number is the number of electrons in that element. The atomic number of helium is 2. That is, the number of electrons in helium is 2. The electron holding capacity of each orbit of the element is 2n2. [n = 1,2,3,4 . . . The serial number of the orbit]

Therefore, the maximum electron holding capacity in the first orbit is 2. And the maximum electron holding capacity in the second orbit is 8.

In the electron configuration of helium, The total number of electrons in a helium atom is 2. We know that a maximum of two electrons can be located in orbit number 1.

Therefore, the two electrons of helium will be in the first orbit. From the helium electron configuration it can be said that the first shell of helium contains two electrons.

## Helium Electron Configuration through orbital

### Helium electron configuration in the Aufbau principle

Helium electron configuration in the Aufbau principle is the arrangement of electrons through orbitals. The Aufbau principle is that the electrons present in the atom will first fill the low energy orbital and then gradually fill the high energy orbital. These orbitals are s, p, d, f. The electron holding capacity of these orbitals is s = 2, p = 6, d = 10, f = 14.

The Aufbau electron configuration method is, 1 s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d. The electron configuration of helium in the Aufbau method is 1s2.

### The electron configuration of Helium in Hund’s principle

Hund’s principle is that when electrons enter the orbitals of equal power, the electrons will randomly enter the orbital as long as the orbital is empty. And the spin of these unpaired electrons will be one-sided.

In Hund’s principle, the Helium electron configuration is 1s2. The last orbit of Helium is always full of two electrons. From the electron configuration of helium, it is seen that helium has no unpaired electrons. Helium does not support Hund’s principle because of its lack of unpaired electrons.

Again, ‘s’ sub-orbit has only one orbital. That is why Hund’s principle does not support the entry of new electrons into the s orbital. Helium electron configuration is He(2) = 1s2. Therefore, the helium atom does not support Hund’s principle.

### Helium electron configuration according to Pauli’s exclusion principle

Pauli’s principle of exclusion is that the value of 4 quantum numbers for any two electrons for the same atom will never be the same. Anyone quantum number is different. The total number of electrons in helium is 2.

Determining the quantum number of the two electrons in the s orbital of helium shows that the value of the first 3 quantum numbers is the same but the 4th quantum number is different.

#### Pauli’s exclusion principle for the first two electrons of helium

1st electron,
The principal quantum number is n = 1
Auxiliary quantum number l = 0
Magnetic quantum number m = 0
And spin quantum number s = +½

For 2nd electron,

The principal quantum number is n = 1
Auxiliary quantum number l = 0
Magnetic quantum number m = 0
And spin quantum number s = – ½

Here, the values of the first 3 quantum numbers (n, l, m) are the same for the two electrons. And the value of spin quantum numbers is different. Whose values are +(1/2) and -(1/2).

## Determination of groups and period through the electron configuration of helium

The helium electron configuration is 1s2. The electron configuration of helium shows that the helium atom has 1 orbit. The last orbit is the period of that element. That is, the period of helium is 1.

Again, helium is an inert element. Therefore, helium is placed in group-18 with all the inert elements of the periodic table. Therefore, we can say that the periodic table of helium is located in period-1 and group-18.

## Determination of the valency and valence electrons of Helium

The electron configuration of helium is 1s 2. The ability of an atom of an element to combine with another atom during the formation of a compound is called valency. Helium is an inert element. Therefore, the valency of helium is zero.

On the other hand, the number of electrons in the last orbit of an element is the valence electrons of that element. The last orbit of helium has 2 electrons. Therefore, the valence electron of helium is 2. Therefore, we can say that the valency of helium is zero and the valence electron is two.

## Reasons for placing helium in group-18 of the periodic table

Helium electron configuration is He(2) = 1s2. The electron configuration of helium shows that the number of electrons in the last orbit of the helium atom is 2.

We know that the number of electrons in the last orbit of an element is the number of groups in that element. Accordingly, the group of helium is two but helium is an inert element.

All inert elements are placed in group number 18 in the periodic table. Therefore, helium is placed in group-18 instead of group-2.

## Why is helium an inert gas?

The elements in group-18 of the periodic table are inert gases. The inert gases of Group-18 are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). We know that the element in group-18 is helium(He).

The electron configuration of helium shows that the orbit at the end of helium is filled with electrons. Helium does not want to exchange or share any electrons because the last orbit of helium is full of electrons.

And helium does not form any compounds because it does not share any electrons. They do not participate in chemical bonding and chemical reactions. For this, they are called inert elements. The inert elements are in the form of gases at normal temperatures. For this inert elements are called inert gases.

The energy emitted to convert one mole of electrons into a negative ion by inserting one mole of electrons into a gaseous atom of an element in a gaseous state is called the electron addiction of that element.

Electron addiction has a periodicity. Moving from left to right of the same period in the periodic table increases the atomic radius of the elements and decreases the value of electron addiction.

The helium atoms are located on the right side of the periodic table. And helium inert gas. For this, the helium atom has no electron addiction.

On the other hand, The helium electron configuration is 1s2. The electron configuration of helium shows that the last orbital(1s) electron of helium is full. The tendency of the element to receive electrons is the electron addiction of the element.

Helium does not exchange any electrons. This is because the last orbital (1s) of the helium is full of electrons. There is no electron addiction in helium for not accepting or rejecting electrons. For this, the electron addiction value of helium is 0.

## Electronegativity of Helium

Helium is an inert gas. Elements that have ionic energy and electron addiction also have electronegativity. It has no electron addiction. Therefore, Helium does not have electronegativity. The value of helium’s electronegativity is 0.

## Ionic properties of helium atoms

Helium is an electron-filled element. The last orbit of helium is full of electrons. Therefore, helium is an inert element and helium atoms are more stable.

Therefore, helium atoms do not want to become ions very easily. It takes a lot of energy to turn a helium atom into an ion. The ionization energy of helium is 2372.3 kJ/mol and 5250.5 kJ/mol.

## Characteristics of helium atoms

• The atomic number of helium is 2. The atomic number of an element is the number of electrons in that element. Therefore, the number of electrons in helium is 2.
• Helium is an s-block element.
• Helium is an inert element.
• The valence of helium is 0 and, the valence electron is 2.
• Helium period is 1 and group is 18.
• Standard atomic weight of helium 4.002602.
• The melting point of helium is 0.95 K (−272.20 ° C, −457.96 ° F) (at 2.5 MPa) and, the boiling point is 4.222 K (−268.928 C, −452.070 ° F).
• Helium is in the form of gas at normal temperature.
• Helium has no electron addiction. That is, the electron addiction of helium is 0.
• Helium has no electronegativity.
• There is no helium oxidation number.
• Helium is an inert gas. Therefore, helium does not form any bonds and compounds.
• Helium does not form bonds with itself and does not form bonds with other elements.
• The ionization energy of helium is 2372.3 kJ/mol and 5250.5 kJ/mol.

## Conclusion

The second element of the periodic table is helium. Which is an inert gas. The main topic of this article is helium electron configuration. Electron configuration of helium atoms , period and group , valence and valence electrons, properties of helium, ionic potential and electron addiction of helium are discussed in this article.

## FAQ

How do you write the electron configuration for helium?
Ans: Helium electron configuration is 1s2 .

How many electrons are in helium?
Ans: 2 electrons.

Why does helium only have 2 electrons?
Ans: The atomic number of helium is 2. The atomic number of an element is the number of electrons in that element. Therefore, the number of electrons in helium is 2.

What is the atomic number for helium?
Ans: 2.

How many electrons are in Helium’s outermost shell?
Ans: 2 electrons.

How many valence electrons does helium have?
Ans: Two valence electrons.