it is helium He. it has 2 electrons
It's one of the unreactive, so-called 'noble' gases. This owes to the fact that its outer electron shell is complete, containing as it does of eight electrons.
Every noble gas does have an outer shell. That's why they don't want to react with any other element. This is because they don't want to gain or lose any electrons. Because they have a full outer shell.
Argon has eight valence (outer) shell electrons. It is a Noble Gas so its valence shell is full (Octet Rule).
For an element to be stable, it must have a full outer shell (valence shell) of electrons. An element with a full outer shell of electrons will act like its nearest noble gas and be stable. Most elements require 8 valence electrons to be stable, however H needs 2.
Two, to raise the outer shell total to eight electrons, like that of the next heavier noble gas.
Helium is the element in the noble geses family that does not have an octet. Helium is the element in the noble geses family that does not have an octet.
1. Neon has 10 electrons; each noble gas has a different number of electrons. 2. The outer electron shell of noble gases is full, containing eight electrons.
Helium has only 2 valence electrons. The rest noble gases have eight.
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.
It's one of the unreactive, so-called 'noble' gases. This owes to the fact that its outer electron shell is complete, containing as it does of eight electrons.
The electron configuration of the noble gasses are such that the valence shell (the outer most shell of electrons) is filled up with eight electrons. the outermost shell of electrons can only fit eight and the noble gasses already have all eight.
Noble gases have a full outer shell, meaning that they have no valence electrons and have 8 electrons in their outer shell. If the outer shell is full they do not need electrons, so they would not want to bond with another element to form a compound.
Radon is a noble gas; it has 8 electrons in its outer shell.
No noble gas will bond in an unexcited state. All noble gases have a complete outer valence shell consisting of eight electrons. (Helium excluded- whose outer electron shell is completed with two electrons)
All noble gasses have 8 valence electrons which means outer electrons. As for electrons overall, argon would have 18.
Argon is a Noble gas--one with eight electrons in its outer shell.
when an element has 8 electron in outer shell it is said to be inert. inert gases are called noble gases.