Atoms - Atoms, Molecules and Ions The Atomic Theory of...

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Atoms, Molecules and Ions The Atomic Theory of Matter Chemists make their observations in the macroscopic world and seek to understand the fundamental properties of matter at the level of the microscopic world (i.e. molecules and atoms). The reason why certain chemicals react the way they do is a direct consequence of their atomic structure . The Atomic Theory of Matter The word "atom" is derived from the Greek word "atomos", meaning indivisible . The philosopher Democritus (460-370 B.C.) believed that matter was composed of fundamentally indivisible particles, called "atomos". Dalton's atomic theory of 1803: 1. Each element is composed of extremely small particles called atoms 2. All atoms of a given element are identical; the atoms of different elements are different and have different properties (including different masses) 3. Atoms of an element are not changed into different types of atoms by chemical reactions; atoms are neither created nor destroyed in chemical reactions 4. Compounds are formed when atoms of more than one element combine; a
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Atoms - Atoms, Molecules and Ions The Atomic Theory of...

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