It means that there are 8 electrons in the outer most shell of the atom. Atoms with 8 valence electrons are generally stable.
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it has a full octet
Halides have 7 valence electrons, but the halide ion, haven gained an electron has 8 valence electrons
Valence electrons are involved in bonding between elements because they determine an element's reactivity. Elements with a similar number of valence electrons tend to bond together to achieve a stable electron configuration, either by losing, gaining, or sharing electrons. This interaction allows elements to form compounds with one another.
No, krypton has 8 valence electrons.
There are 8 valence electrons in the noble gases, the family of elements furthest to the right on the periodic table.