It depends on what element you start with.
Eight
the same number of electrons needed to fill their octet, the same number of valence electrons,
2
Noble gasses have the complete octet of valence electrons. The are in the family 18 of the periodic table. They are unlikely to react with other elements.
In chemistry, the octet and duplet rules are part of electronic configuration. The octet rule is when the outermost shell has 8 valence electrons. The duplet rule is when the outermost shell has 2 valence electrons, e.g. Helium and Hydrogen.
The octet rule.
lone pair of electrons & bonded pairs of electrons
the same number of electrons needed to fill their octet, the same number of valence electrons,
8 valence electrons
2
Noble gasses have the complete octet of valence electrons. The are in the family 18 of the periodic table. They are unlikely to react with other elements.
it has a full octet
An octet
In chemistry, the octet and duplet rules are part of electronic configuration. The octet rule is when the outermost shell has 8 valence electrons. The duplet rule is when the outermost shell has 2 valence electrons, e.g. Helium and Hydrogen.
The octet rule.
Octet
Boron has two few valence electrons to ever obtain a full octet.
The octet rule is the tendency of many chemical elements to have eight electrons in the valence shell.