Nuclide The general term applied to each

Nuclide the general term applied to each unique atom represented by zX, where X is the symbol for a particular element. (21)... 

Nucleotide a monomer of the nucleic acids composed of a five-carbon sugar, a nitrogen-containing base, and phosphoric acid. (22.6) Nucleus the small, dense center of positive charge in an atom. (2.4) Nuclide the general term applied to each unique atom represented by X, where X is the symbol for a particular element. (19)... 

For most purposes the nucleus can be regarded as a collection of nucleons (neutrons and protons), and the internal structures of these particles can be ignored. Recall that the number of protons in a particular nucleus is the atomic number (Z) and that the sum of the neutrons and protons is the mass number (A). Atoms that have identical atomic numbers but different mass number values are called isotopes. The general term nuclide is applied to each unique atom and is represented by where X represents the symbol for a particular element. 

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