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chemistry, Different masses of ''assumed'' pure sustances share the exact same properties. Inferences Atoms combine in whole number ratios, Atoms, electron, and periodic trends The Nuclear Atomic Model Dalton, Dalton Observation-1 Different masses of ''assumed'' pure sustances share the exact same properties., Thomson Observation found a small negatively charged particle that had a mass smaller than the mass of a single hydrogen atom, *sphere *electron are inside *positive fluid Limitation -no specific location for mass -explanation for the spherical shape, Dalton Observation-2 In a chemical reactant the mass of the reactant and the mass of the products are the same, In a chemical reactant the mass of the reactant and the mass of the products are the same Inferences In a chemical reactant is the same as the mass of products, therefore ''things'' that make up reactants are still present in the products no matter is created or destroyed in a chemical reaction., *small,dense,positive mass *electron orbit the nucleas *mostly empty space Limitation , most α particles go through the gold foil undeflected just a small fraction undergo major & minor deflections Inferences *major & minor deflection are the result of the alpha particle encountering a concentrate positive on its path throughthe atom *since most alpha particles go through undeflected they are travelling through ''empty space'' inside the atom, Dalton Observation-3 In a chemical reactant 2 pure elements may combine in different whole number ratios. Besides, between 2 product more than 1 product is possible. Each product will have its own unique ratio between the masses of the elements.