Helium has 2 protons and 2 electrons.
Helium has 2 valence electrons. Being in Group 18 of the periodic table, helium is a noble gas and has a full outer electron shell.
helium has only one energy level (with 2 electrons in it).
helium has 2 electrons in its 1st orbital. It doesn't have 2nd or 3rd orbitals.
Hydrogen has atomic number 1 whereas helium's is 2.
Helium does not form any known stable compounds, and thus it is nearly always in the 0 oxidation state.
liquid, and gas.
gaseous state.
Helium is an odorless gas.
Helium's chemical symbol is He.
-268.93 °C
helium is a colourless odourless gas
Helium is a gas at room temperature.