CHEM 121 Lecture Notes - Lecture 2: Deuterium, Weighted Arithmetic Mean, Mass Number
14 Apr 2016
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Document Summary
The structure of the atom and periodic table (chapter 2 lecture) Atom: the basic unit structural unit of an element: the smallest unit of an element that retains the chemical properies of that element. Atoms consist of three primary paricles: electron, protons, neurons. Nucleus: small, dense, posiively charged region in the center of the atom contains : protons: posiively charged paricles, neutrons: uncharged paricles. Symbolic representaion: atomic number (z): the number of protons in the atom, mass number (a): sum of the number of protons and neutrons. Atomic calculaions: mass number = number of protons + number of neurons, number of neurons = mass number number of protons, number of neurons = a z. Selected properies of the 3 basic subatomic paricles. Isotopes: atoms of the same element having diferent masses: contains the same number of protons, contains diferent numbers of neurons.
