Atoms can complete their set of valence electrons by either taking some from another element (ionic bond), or by sharing valence electrons with another element (covalent bond).
An ionic bond is usually between a non-metal and a metal, and a covalent bond is usually between two non-metals.
If you're asking how will an atom with 5 valence electrons will achieve a full set of valence electrons, then the answer would be that they bond with other atoms to gain a full set of the valence electrons by sharing or gaining 3 electrons.
Every transition metal has a different number of electrons, they go from 21-30 electrons, then 39-48 elctrons, then 71-80 electrons, and 103-112 electrons.
They will gain 3 electrons from something with 3 valence electrons.
STABLE
If I recall correctly, it's because they don't have any electrons in their atoms. Atoms react in order to get a full set of 8 electrons, and the less electrons an atom has, the more likely they are to react.
So this way it gets 8 electrons in it's valence, creating a full set.
Sr, Sn, I
Atoms with eight valence electrons are unlikely to transfer electrons to other atoms or to share electrons with other atoms. As a result, inert gases do not react easily with other elements.Your welcome fellow students... bye.
noble gases
The noble gasses.
All of them. Except the noble gases.
Getting a full set of valence electrons