Respuesta :
Because valence electrons are on the outermost energy level; meaning they are farthest away from their nucleus. The protons in the nucleus try to hold onto the electrons in the energy levels, but the valence electrons have a weaker grip to the nucleus than the others due to the distance between them, and are thus the easiest to be involved in bonding to other atoms.
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Valence electrons of an atom the are the only electrons likely to be involved
in bonding to other atoms because they need to attain a stable octet
configuration.
Valence electrons are usually found in the outermost shell and require the
loss or gain of a certain amount of electrons depending on the element in
order to attain stable octet configuration.
The attainment of this octet structure makes the element to become stable
and non- reactive to other elements.
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