electrons
These are the electrons.
isotope.
electron
Electrons contain energy stored in chemical bonds.
An electron, it plays a part in forming/breaking all proper chemical bonds (there are other types of bonds but they don't really cause chemical reactions and as such are rather boring)
Electrons are either transferred between atoms to form ionic bonds or shared between atoms to form covalent bonds. Either way, bonds are formed through electrons.
Assuming that you mean the chemical properties, the electrons are what define each element. If you meant subatomic particles, then it doesn't matter; each subatomic particle has unique characteristics.
Electrons are the subatomic particles specifically responsible for combining atoms to form a new substance. They are involved in forming chemical bonds between atoms by being shared or transferred between them.
Electrons are the subatomic particles that determine an atom's chemical behavior and bonding ability. They are involved in the formation of chemical bonds between atoms through interactions with other atoms' electrons.
bosons
Electors is the subatomic particle. This is what is the most involved in chemical bonding.
Electrons