A chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species.- Chemical element
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.- Chemical reaction
Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.- Chemical substance
Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.- Chemical reaction
When different elements undergo chemical reactions, atoms are rearranged into new compounds held together by chemical bonds.- Chemical element
Chemical substances may be combined or converted to others by means of chemical reactions.- Chemical substance
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A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds.
A compound can be converted to a different chemical substance by interaction with a second substance via a chemical reaction.