It is measured in a unit called amu (atomic mass unit). It depicts how many times an atom of an element is heavier than one-twelfth (1/12th) the mass of one atom of carbon-12 of mass of one carbon atom. Element symbols for chemical elements normally consist of one or two letters from the English alphabet and are written with the first letter capitalised.Ītomic mass refers to the mass of an atom. The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom.Ĭhemical symbols are the abbreviations used in chemistry for chemical elements.
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