One energy level
Helium has only one energy level with two electrons
Electrons of hydrogen fill up to two energy levels, while electrons of helium fill up to a total of two energy levels as well. Helium has an additional energy level compared to hydrogen because it has 2 electrons, filling up both the first and second energy level.
Helium has 2 electrons.
Helium atom has 2 electrons.
Helium-4 has 2 electrons.
Helium has 2 valence electrons.
2 electrons as the atomic number of helium is 2
Helium-3 has 1 neutron and 2 electrons. Helium-4 has 2 neutrons and 2 electrons.
2 valence electrons for helium (helium has only 1 shell)
A neutral atom of helium has 2 electrons.
2 electrons
2