[He]
or
1s2
The ground state electron configuration of hydrogen is 1s^1, meaning it has one electron in the 1s orbital. Helium in its ground state has an electron configuration of 1s^2, indicating it has two electrons in the 1s orbital. So, the main difference is that hydrogen has one electron in its outer shell while helium has two electrons in its outer shell.
There is none because there is no noble gas above Helium
1s2 Or, He(2) i.e., Helium has only two electrons and it is a completely filled first shell making it the simplest noble gas.
The electron configuration for nitrogen is written as 1s2 2s2 2p3.
The electron configuration of helium is 1s2.
The ground state electron configuration of hydrogen is 1s^1, meaning it has one electron in the 1s orbital. Helium in its ground state has an electron configuration of 1s^2, indicating it has two electrons in the 1s orbital. So, the main difference is that hydrogen has one electron in its outer shell while helium has two electrons in its outer shell.
Noble gases, like helium, neon, and argon, have no unpaired electrons in their ground state electron configuration. This means that all of their electrons are paired up in orbitals.
There is none because there is no noble gas above Helium
Electron configuration of helium: 1s2
Lithium ion (Li+) and beryllium ion (Be2+) have the same electron configuration as helium because they both have filled electron shells.
1s2 Or, He(2) i.e., Helium has only two electrons and it is a completely filled first shell making it the simplest noble gas.
The electron configuration for nitrogen is written as 1s2 2s2 2p3.
The electron configuration of helium is 1s2.
The electron configuration of helium is 1s2; two electrons on the first (and the single) electron shell.
The electron configuration of beryllium is written as [He] 2s2. This means that it has 2s2 electrons above the configuration of Helium.
Helium typically does not form cations because it has a stable configuration with a full outer electron shell. In order to form a cation, an atom usually loses or gains electrons in order to achieve a stable electron configuration. Helium's stable electron configuration makes it unlikely to form a cation.
The ions of elements nitrogen (N3-), oxygen (O2-), and fluorine (F-) will have the same electron configuration as a sodium ion (Na+), which is the same as the electron configuration of the noble gas neon.