Atoms, Ions, Molecules (Biology)
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Ion
atom that has gained or lost one or more electrons
Ionic Bond
chemical bond formed through electrical force between oppositely charged ions
Covalent Bond
chemical bond formed when two atoms share one or more pairs of electrons
Atom
smallest basic unit of matter
Compound
substance made of atoms of different elements that are bonded together in a particular ratio
Element
substance made of only one type of atom that cannot be broken down by chemical means
Molecule
two or more atoms held together by covalent bonds; not necessarily a compound
