phosphorus
Only in nuclear physics and nuclear chemistry laboratories; copernicium is an artificial chemical element.
Sodium is a compound.
Zinc is only a metallic chemical element.
The only element that is not found in any of the 20 essential amino acids but is found in nucleic acids is Phosphorus. It is found in the "Sugar-Phosphate backbone" of nucleic acid but is not found in any of the essential amino acids. Many proteins interact with phosphate groups but they do not make up the protein.
This is the atom of a chemical element, unbreakable by chemical methods.
No, it is not. It is a chemical element which was discovered only in 1898.
Mendelevium is an artificial, man made chemical element.
Neptunium is an artificial chemical element but neptunium can be found also in the nature as a result of decay processes in uranium ores, only in ultratraces.
A chemical element is a substance with only one type of atom in it (e.g. only carbon atoms). The known chemical elements are arranged on the Periodic Table of the Elements. Every element has it's own chemical symbol, which is used as a scientific shorthand for quick elemental notation (e.g. Carbon = C, Promethium = Pm).
Only in nuclear physics and nuclear chemistry laboratories; copernicium is an artificial chemical element.
A chemical element is homogeneous only if it is monoisotopic; but in practice this aspect is neglected. A chemical element is not a "change".
Only one chemical element begins with the letter X. Xenon is a chemical element. It has the symbol Xe. It is the only chemical element that begins with the letter x.
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Hassium is an artificial chemical element and can exist only in very special nuclear physics laboratories.
Ununhexium is an artificial chemical element; it is prepared only in nuclear physics laboratories using particle accelerators.
Sodium is a compound.
Only aluminium is a chemical element.