The first and only filled shell has two electons. The nucleaus has two protons. He-4 also has two neutrons.
Helium has only 1 shell with two electrons.
Helium has only 1 shell with two electrons.
The electron configuration of helium is 1s2; two electrons on the first (and the single) electron shell.
Helium has 2 electrons and Radon has 86 electrons but both have 8 valence electrons (8 electrons in their outermost shells)
Since Helium is a noble gas meaning it is stable, and the fact that it has one shell, it has 2 shells in its inner-most shell.
The atom that has 2 completely filled electron shells and no electrons anywhere else is helium. Helium has a total of 2 electrons, with both shells being completely filled with 2 electrons in the first shell.
Helium has 2 electrons.
Hydrogen has one electron and needs one more. Helium has two electrons and has filled shell. Carbon needs four more electrons to fill the valence shell Oxygen needs two more electrons to fill the valence shell
Helium atom has 2 electrons.
Helium-4 has 2 electrons.
Atoms are trying to get a stable electron configuration, usually by filling their outermost energy level with a full set of electrons. This typically involves having 8 electrons in the outermost energy level, except for hydrogen and helium, which only need 2 electrons.
Helium has 2 valence electrons.