CHEM 1070 Chapter Notes - Chapter 4: Weighted Arithmetic Mean, Krypton, Beryllium
24 Sep 2016
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Atom: the smallest identifiable unit of an element. Said that if you divided matter into smaller and smaller pieces, you would eventually end up with tiny, indestructible particles called atomos (atoms: atomos means indivisible. Electron: a negatively charged particle that occupies most of the atom"s volume but contributes almost none of its mass. 0. 00091 * 10^-27 kg or 0. 00055 amu. Nucleus: the small core containing most of the atom"s mass and all of its positive charge. The nucleus is made up of protons and neutrons. Mass: 1. 67262 * 10^-27 kg or 1. 0073 amu. Neutron: a nuclear particle with no electrical charge and nearly the same mass as a proton. Mass: 1. 67492 * 10^-27 or 1. 0087 amu. Atomic mass unit (amu): one-twelfth of the mass of a carbon atom containing 6 protons and 6 neutrons. A fundamental property of protons and electrons. Positive and negative electrical charges attract each other. Positive-positive and negative-negative charges repel each other.
