It does.
A full set of valence electrons typically consists of 8 electrons, except for hydrogen and helium, which have a full valence shell with 2 electrons.
An element that does not require eight electrons for a full set of valence electrons is represented by the element symbol B. Boron only needs six electrons to complete its valence shell and achieve stability.
An atom with 4 valence electrons will have to either gain 4 electrons or lose 4 electrons to achieve a full set of eight electrons.
They will gain 3 electrons from something with 3 valence electrons.
The noble gases (group 18/VIIIA/0) are naturally occurring elements that have a full valence shell with eight valence electrons (an octet), except for helium which has two valence electrons (a duet). This makes these elements very stable and very nonreactive.
Atoms with a full set of electrons in their outermost energy level are generally the noble gases, such as helium, neon, and argon. These atoms have stable electronic configurations that make them less likely to form chemical bonds with other atoms.
Phosphorus, with 5 valence electrons, needs to gain 3 electrons to have a full set of 8 valence electrons. This would allow it to achieve a stable octet configuration, resembling the noble gas configuration of argon.
The octet rule.
Neon has 8 valence electrons. This is because neon is in the 8th group (or 18th column) of the periodic table, and elements in this group have a full set of 8 valence electrons.
Helium, neon, and argon have a zero valency because they have a full outer electron shell (valence shell). This makes them stable and unreactive because they do not need to gain, lose, or share electrons to achieve a full valence shell. Since they already have a complete set of electrons, they do not form chemical bonds easily.
They all have a full set of valence electrons.
An atom with 5 valence electrons can achieve a full set of 8 valence electrons by either gaining 3 electrons through bonding with other atoms or losing 5 electrons by forming ionic bonds. Another option is to share electrons with other atoms through covalent bonding to reach a stable octet.