Respuesta :
Substances have different tendencies to donate or accept electrons. When a really good donor meets a great acceptor, the chemical reaction releases a lot of energy. Oxygen (O2) is the best electron acceptor and is used in many aerobic reactions (reactions with oxygen). Hydrogen gas (H2) is a good electron donor.
When O2 and H2 are combined, along with a catalyst, water (H2O) is formed. This example of a redox reaction can be written like this:

When O2 and H2 are combined, along with a catalyst, water (H2O) is formed. This example of a redox reaction can be written like this:

Electrons are the subatomic particle that is present in the atom. Valence electrons are capable of sharing, accepting, and donating electrons.
What are valence electrons?
Valence electrons are present in the outermost shells that are required to participate in the chemical reaction for the bond formation.
Valence electrons are the species that are shared, gained, or lost by an atom to another to attain the noble gas configuration so that a stable bond is created.
Therefore, the valence electrons can accept, share and donate electrons.
Learn more about valence electrons here:
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