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118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
The Hatter's hat shows an example of the old pre-decimal notation: the hat costs 10/6 (ten shillings and sixpence, a half guinea). Before decimalisation in 1971 , the pound was divided into 20 shillings , and each shilling into 12 pence , making 240 pence to the pound.