1 Metals And Their Properties-Physical and Chemical All the things around us are made of 100 or so elements. These elements were classified by Lavoisier in to metals and non-metals by studying their properties. The metals and non-metals differ in their properties.
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More generally, the term copal describes resinous substances in an intermediate stage of polymerization and hardening between gummier resins and amber. The word copal is derived from the Nahuatl language word copalli, meaning  incense .opal resin from Hymenaea verrucosa is also found in East Africa and is used in incense. By the 18th century, Europeans found it to be a valuable ingredient in making a good wood varnish.