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Chemically, metals are defined as elements which form positive ions in solutions and whose soluble oxides are basic. The elements which form positive ions in solutions or are parts of negative ions and form soluble oxides which are acidic, are called non-metals.Some elements act as metals under certain conditions and as non-metals under other conditions. Such elements are classified as amphoteric.Another group consists of elements which do not combine with other elements under normal conditions. Until recently, it was believed that these elements could not enter into any chemical combination and they were called the inert elements. Chemists have produced compounds of some of these elements.Metals are the chemical opposites of non-metals. Metals tend to lend electrons while non-metals tend to borrow or share electrones when they combine with each other to form salts.Metals and non-metals generally differ in physical properties. Metals are good conductors of electricity and heat, non-metals are generally non-conductors or very poor conductors. In the solid state metals have a haracteristic luster which non-metals do not have. And in this state metals are malleable, but non-metals are brittle and non-malleable.Non-metals generally include the following 22 elements: helium, neon, argon, krypton, xenon, radon, hydrogen, fluorine, chlorine, bromine, rodine, astatine, oxygen, sulphur, selenium, tellurium, nitrogen, phosphorus, arsenic, carbon, sincon, and boron. The remaining elements are generally classified as metals. As lor hydrogen, it has a dual character and is included in both groups.