He
He
Helium.
Helium's electron structure is 1s2, meaning two electrons in the 1s orbital
One option is a helium atom. Another is a Lithium cation. Or a beryllium cation. Or boron for that matter. Cause Li would be 1s2 2s1, Be would be 1s2 2s2 and Boron would be 1s2 2s2 2p1 so if they were to lose their valence electrons to become ions (cations) then they would have a 1s2 orbital. :D
The electron orbital pattern of boron is 1s2 2s2 2p1. This means it has 2 electrons in the 1s orbital, 2 electrons in the 2s orbital, and 1 electron in the 2p orbital.
S orbital contains only 2 electrons and not elements.
Fluorine (F) has 9 electrons, with the electron configuration of 1s2 2s2 2p5. The orbitals that are occupied in fluorine are the 1s, 2s, and 2p orbitals. The 1s orbital contains 2 electrons, the 2s orbital contains 2 electrons, and the 2p orbital contains 5 electrons.
S- = 1s2 2s2 2p4
Electron configuration of helium: 1s2
The electron configuration of helium is 1s2.
The element that corresponds to the electron configuration 1s2 2s2 is Beryllium (symbol Be), which has an atomic number of 4. It has 4 electrons, with 2 in the 1s orbital and 2 in the 2s orbital.
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.