There is none because there is no noble gas above Helium
The electron configuration of helium is 1s2.
Helium has a very simple electron configuration: 1S2
Noble gas configuration has 8 valence electrons, as ns2 np6.
1s1
The electron configuration of helium is 1s2.
Noble gases have completely filled orbitals / energy levels. They generally have 8 valence electrons (helium has only 2) and have stable electronic configuration.
As it has two postively charged protons in it (along with two neutrons), a Helium nucleus has two electrons 'orbiting' around it. Knowing this, we need to find which orbits they are in. The lowest energy orbital in an atom is made up of a single 'S' orbital (the 's' describes its shape - spherical) with a principal quantum number of 1 (which indicates the size of the orbital, 1 being the smallest). This is therefore denoted 1s . This orbital can accept two electrons, so both of the helium electrons go into it. The way to express this as a electron configuration is 1s2 , the superscript '2' indicating the number of electrons in the orbital. Feel free to stop at that point. To be a bit more technical, when we write 1s2 the '1s' is actually a mathematical wavefunction, and the superscript '2' is there because there are two electrons whose wavefunction is 1s, and so we multiply those wavefunctions together - hence the configuration actually means 1s-squared.
How many atoms / electron clouds does helium have ?
The noble gas configuration of nitrogen is [He] 2s^2 2p^3. This means that nitrogen has the same electron configuration as helium for the inner electrons, with 2 electrons in the 2s orbital and 3 electrons in the 2p orbital.
Electron configuration of helium: 1s2
The electron configuration of helium is 1s2.
The electron configuration of helium is 1s2. This means that there are two electrons in the 1s orbital in helium.s stands for the orbital in which the electrons are present
There are 2 electrons in the 1s orbital so the configuration is 1s2.
The electron configuration of beryllium is written as [He] 2s2. This means that it has 2s2 electrons above the configuration of Helium.
Noble gases have completely filled orbitals / energy levels. They generally have 8 valence electrons (helium has only 2) and have stable electronic configuration.
As it has two postively charged protons in it (along with two neutrons), a Helium nucleus has two electrons 'orbiting' around it. Knowing this, we need to find which orbits they are in. The lowest energy orbital in an atom is made up of a single 'S' orbital (the 's' describes its shape - spherical) with a principal quantum number of 1 (which indicates the size of the orbital, 1 being the smallest). This is therefore denoted 1s . This orbital can accept two electrons, so both of the helium electrons go into it. The way to express this as a electron configuration is 1s2 , the superscript '2' indicating the number of electrons in the orbital. Feel free to stop at that point. To be a bit more technical, when we write 1s2 the '1s' is actually a mathematical wavefunction, and the superscript '2' is there because there are two electrons whose wavefunction is 1s, and so we multiply those wavefunctions together - hence the configuration actually means 1s-squared.
How many atoms / electron clouds does helium have ?
The He+ ion (helium ion) has the same electron configuration as an atom of helium (He) because it has lost one electron, making it a 1+ ion. Both the helium atom and He+ ion have a total of 2 electrons arranged in the 1s orbital.
In the molecular orbital configuration of HF, the fluorine 2p orbital forms a sigma bond with the hydrogen 1s orbital, resulting in the formation of a sigma bonding orbital and a sigma antibonding orbital. The electrons occupy the sigma bonding molecular orbital.
To use the example of helium, which has theelectronic structure 1s2. The 1 refers to the orbital number (1, 2, 3 etc, also known as the principal quantum number), the letter refers to the orbital type (s, p, d, f which corresponds to the azimuthal quantum number), and finally the superscript 2 refers to the number of electrons in that orbital.So for helium's 1s2 we have 2 electrons in the 1s orbital (filling it).Another example could be atomic iron which has the [Ar] 3d6 4s2 configuration. This is the argon electronic structure (1s2 2s2 2p6 3s2 3p6), and then 6 electrons in the 3d orbitals, and 2 electrons in the 4s orbital as well.
Helium has 2 valence electrons in its outer energy level. This is because helium has 2 electrons, filling its first energy level completely.