Helium has 2 valence electrons.
Helium only needs two electrons to have a filled outermost energy level.
Helium atoms only need 2 valence electrons to have a filled outermost energy level because helium is in the first period of the periodic table and its outermost energy level can only hold a maximum of 2 electrons.
It is the most stable element in the universe and does not need anymore electrons. Its outermost energy level is full.
2 electrons in the only shell helium has.
only 2 electrons.
0 It already is full
Helium has two electrons total, and the second energy level can hold a maximum of 8 electrons. However, in the case of helium, the second energy level will only contain two electrons as it is the outermost energy level.
Helium has 2 valence electrons. All other noble gases have 8 valence electrons.
Helium has only two electrons with one ring (or energy level). Both the electrons are in the one and only energy level / shell / ring.
There are 8 electrons in the outer level of all the noble gases except helium. This full outer level gives them stability and makes them less reactive. Helium, as a noble gas, has only 2 electrons in its outer level.
Carbon has 4 outermost electrons.
helium has 2 valence electrons (in s orbital) and has complete s orbital. So it does not need to gain or lose more electrons to be stable.