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METALS  AND  NON-METALS INTRODUCTION More than 114 elements are known, which combine with each other in various ways to form millions of compounds. On the basis of their physical and chemical properties the elements have been classified, so that their characteristics could be generalized and easily learnt. These are classified into two main groups namely metals and non-metals. As we can see from periodic table, there are only 22 nonmetals. Of these, 11 are gases (H, N, O, F, Cl, He, Ne, Ar, Kr, Xe, Rn) one is liquid (Br) and the rest are solids. Metals are characterized by several distinctive properties such as high electrical conductivity, metallic luster, malleability and ductility. Non–metal does not usually exhibit such behavior. OBJECTIVES The students will be able to : ·          Acquire knowledge about Metals and Non-metals. ·          Understand the physical properties of Meta...