<P> List of the elements are available by name, atomic number, density, melting point, boiling point and by symbol, as well as ionization energies of the elements . The nuclides of stable and radioactive elements are also available as a list of nuclides, sorted by length of half - life for those that are unstable . One of the most convenient, and certainly the most traditional presentation of the elements, is in the form of the periodic table, which groups together elements with similar chemical properties (and usually also similar electronic structures). </P> <P> The atomic number of an element is equal to the number of protons in each atom, and defines the element . For example, all carbon atoms contain 6 protons in their atomic nucleus; so the atomic number of carbon is 6 . Carbon atoms may have different numbers of neutrons; atoms of the same element having different numbers of neutrons are known as isotopes of the element . </P> <P> The number of protons in the atomic nucleus also determines its electric charge, which in turn determines the number of electrons of the atom in its non-ionized state . The electrons are placed into atomic orbitals that determine the atom's various chemical properties . The number of neutrons in a nucleus usually has very little effect on an element's chemical properties (except in the case of hydrogen and deuterium). Thus, all carbon isotopes have nearly identical chemical properties because they all have six protons and six electrons, even though carbon atoms may, for example, have 6 or 8 neutrons . That is why the atomic number, rather than mass number or atomic weight, is considered the identifying characteristic of a chemical element . </P> <P> The symbol for atomic number is Z . </P>

How do you find the chemical element of an atom
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