1. The elements whose atom gains electrons to form negative ions.
2.Naturally occurring compounds of metals
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1. The outer shells of non-metal atoms gain electrons when they form ions: the ions formed are negative, because they have more electrons than protons. the ions have the electronic structure of a noble gas (group 0 element), with a full outer shell.
2.Ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile extracting them. The method used to extract a given metal from its ore depends upon the reactivity of the metal and so how stable the ore is.
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