Helium has 2 valence electrons and has completely filled orbitals / shells and helium is stable.
Hydrogen has one electron and needs one more electron to be stable. Helium has 2 valence electron (completely filled shells) and is already stable.
In both cases, their outer shell is an s orbital which needs to be filled with only 2 electrons to make a full outer shell making it stable.
Helium has two valence electrons, it has completely filled s orbital and has stable electronic configuration. Hence it is chemically inert
Helium has 2 valence electrons (maximum for s orbital) and is stable. Hence it will not gain or lose electron.
None. Helium has a full shell 1s2
Noble gases have completely filled orbitals / energy levels. They generally have 8 valence electrons (helium has only 2 valence electrons) and have stable electronic configuration.
All noble gasses have 8 valence electrons, it is what makes them "stable" and therefore are non reactive.
8 electrons (except for helium which has only 2 valence electrons)
Noble gases are also known as the inert gases, meaning they don't react because they have a stable octet (eight electrons in their valence shell). They all have eight electrons in their valence shell with the exception of helium because helium is rebel, but they are all nonreactive including helium.
Calcium has 2 valence electrons and it typically loses these 2 electrons to achieve a stable configuration.
Helium has two valence electrons. It is the only noble gas not to have eight valence electrons. Helium has the electronic configuration 1s2.The Noble gases have eight valence electrons in their outer shell.
Helium has two valence electrons in the 1s orbital.
8 valence electrons are needed for an element to become stable, which is why the noble gases do not interact with any other elements. They are already stable. However, the exception is Helium, the first noble gas, which only has two valence electrons. 8 valence electrons are needed on the 2nd and 3rd valence shells for any molecule to become stable.
Noble gases have completely filled orbitals / energy levels. They generally have 8 valence electrons (helium has only 2 valence electrons) and have stable electronic configuration.
helium has completely filled valence orbitals and hence is stable
A stable atom has 8 electrons in its outer most valence shell. A simple way to remember this is that all atoms want to be like the noble gases which all have 8 electrons (except helium but the reason is complicated and not necessary here)
All noble gasses have 8 valence electrons, it is what makes them "stable" and therefore are non reactive.
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.
When the atom has 8 valence electrons.
8 electrons (except for helium which has only 2 valence electrons)
they want to become stable by having all of the valence filled they want to become stable by having all of the valence filled
Noble gases are also known as the inert gases, meaning they don't react because they have a stable octet (eight electrons in their valence shell). They all have eight electrons in their valence shell with the exception of helium because helium is rebel, but they are all nonreactive including helium.