... strontium. He also discovered magnesium and boron by using potassium, which is more reactive, to displace these elements from their compounds. He also showed iodine to be element and produced some of the first elemental aluminium. Dalton He proposed that atoms were the fundamental particles of nature * All matter consists of indivisible atoms (we cannot divide a single atom) correct * Atoms of a particular element are identical in mass and have identical properties (no, isotopes exist which have different masses and have different properties) * Atoms of each element have a unique mass * Atoms are neither created or destroyed in reactions (not true, they can be in nuclear reactions) * Compounds are formed from the combination of the atoms of two or more elements * The proportion and kind of atoms is fixed in a given compounds * Atoms combine in numerical ratios * The most table compounds of two elements contain atoms in a one-one ratio The ...

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