A group of atoms existing together as one species and having characteristic properties is called a molecule. This force which holds the atoms together within a molecule is called a covalent bond. Noble gases neither combine chemically with any other element nor among themselves i.e.they are chemically inert. Noble gases are inactive or stable because they have 8 … [Read more...] about Lewis Symbols
molecule
Classification of matter
Matter Matter is defined as anything that occupies space and possesses mass. Classification of Matter (1) Physical classification (a) Solid (b) Liquid (c) Gases Solid Liquid Gases (1) They have fixed shape and volume They do not have fixed shape but have fixed volume They do not have fixed … [Read more...] about Classification of matter