First of all there is no such thing a a valence neutron. However there are valence electrons.Valence electrons are the electrons of the outer most layer or shell called valence shell. Based on a Bohr diagram or Lewis structure you can see that Helium has 2 valence electrons.
Helium has 8 valence electrons. It is a noble gas. none = 0
Helium has 2 valence electrons.
As helium is located in group 18, it has no valence electrons.
Radium has one valence electron.
Helium-3 has 1 neutron and 2 electrons. Helium-4 has 2 neutrons and 2 electrons.
2
8
2 valence electrons
Helium has two protons and two neutrons (and two electrons).
Helium has 2 valence electrons.
The valence of the element helium is 0.
2