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Releases energy during the process.
Requires energy input to proceed.
Oxygen, carbon, hydrogen, nitrogen.
Number of protons in an atom.
They have different numbers of neutrons.
Atoms gain or lose electrons, becoming ions.
Molecules consist of the same element; compounds have different elements.
Formed by the attraction between oppositely charged ions.
Atoms share electrons to achieve stability.
Polar bonds share electrons unequally; nonpolar bonds share equally.