Chapter 2-Structure Atoms and Matter

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  Chapter 2 by  The Modern Atomic Theory 1. All matter is composed of atoms.  The atom is the smallest body that  retains the unique identity   of the element. 2. Atoms of one element cannot be converted into atoms of another element in a chemical reaction.  Elements can only be converted into other elements in nuclear reactions. 3. All atoms of an element have the same number of protons and electrons, which determines the chemical behavior of the element.  Isotopes of an element differ in the number of neutrons, and thus in mass number. A sample of the element is treated as though its atoms have an   average mass. 4. Compounds are formed by the chemical combination of two or more elements in specific ratios.    Particle Mass (g) Charge (Coulombs) Charge (units) Electron (e - ) 9.1 x 10 -28  -1.6 x 10 -19  -1 Proton (p + ) 1.67 x 10 -24  +1.6 x 10 -19  +1 Neutron (n) 1.67 x 10 -24  0 0 mass p = mass n = 1840 x mass e -  
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