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Pege, Dele, 20., * Atom: An atom, is the Smallest unit of, Mattex., * Molecules: brroup of Elwo, more, atoms, called, * Compound : 0ixoup of Jwo., types of atom, ¥ Element brroup of gwo ox, are, Molecules., more "different", Called Compound-, "Same, more, types of atom called Element., Law of Chemical, Combination, Griven by : Antoine L Lavoisier, D Law, of Conservation of MasS, Mass can, neither, be, created, nox, destroyed ina, Chemical deaction., A+ B +, AB, Keactants, Product, Total Mass of A and se Total Mass of, AB, Mass of Reactants and P8duct, both, is dame-

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Pege No, Date, 20, Daltom's Atomic Jheoxy, biven by : John Dalton, D All mattex is, Particles, in chemical reaction-, of very tiny, made up, atoms ,which participate, Called, jv Atoms are, indivisible particles, which, destroyed in, Cannot, be, created, or, Chemical, reaction, ) Atoms of a given, in mass, are identical, properties., elements, and, Chemical, iv) Atoms of different, different, elements, have, masses, and, Chemical, Properties., of Small, ratio, to foxm, V), Atoms, combine, in, the, whole., numbers, Compounds., of, vi) The relative, atoms, number, and, Kinds, are constant, in, a given, compound-, Drawbacks:, can be Subdivided into Subatomic particles, that is Clectron, Proton and neutron-, LAtom

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Pege No, De, 20, D Atoms, of the Same elements, different, may have, or, Same masses., Substances made, Kind of, up of, may have different, the Same, atoms:, Properties., What is Alom ?, Atoms are the., Smallest particles of an, which may, elements, may not, but takepart, independent existence, in, have, a chemical Teaction., Shape and Size of Atom:, Øhape +, Spherical., of atoms are measure, in nanometers"., Size Radius, Im, 1 nm = 10, 10 nm, %3D, -9, 100