8
All have six valence electrons.
Boron has 3 valence electrons.
4 valence electrons are present in methane
Since krypton is a noble gas in the group number 18, it has 8 valence electrons. Eight is the maximum number of valence electrons.
4
8 valence electrons
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An atom requires 8 valence electrons to be chemically stable. The elements with 8 valence electrons are the Noble Gases, and they are both stable and largely unreactive.
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)
1 more
Calcium has 2 valence electrons and it typically loses these 2 electrons to achieve a stable configuration.
Argon is a noble gas. All noble gases have stable outer shells with 8 valence electrons (with the exception of He, which as 2).
8 valence electrons are there in in neon's family .They are stable in nature.
Radon, being a noble gas, has 8 valence electrons, giving it a stable octet.
It depends on the atom. List what element the atom is from.
5 valence electrons because it needs to gain 3 electrons in order to become stable
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.