Chemistry Unit II Study Guide

Chemistry Unit II Study Guide - Unit 2 Atomic Theory and...

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Unit 2 – Atomic Theory and Structure Atomic Mass: A small unit of mass equal to 1.66 x 10^-24 grams Family: A group in the periodic table ----------- Amu: The unit which determines the atomic Mass Mole: The number equal to the number of carbon atoms in exactly 121 grams of pure 12C: Avogadro’s number. One mole represents 6.022 x 10^23 units Mass Number: The total number of protons and neutrons in the nucleus of a given atom. Period: A chat showing all elements arranged incolumns in such a way that all the elements in a given column exhibits similar chemical properties. Proton: A positively charged subatomic particle located in the atomic nucleus. Cathode Ray: The rays emanating from the negative electode (cathode) in a partially evacuated tube Atomic number: The symbol which is represented above an element in the periodic table Alpha particle: A common mode of decay for heavy radioactive nuclides resulting in a loss of 4 in mass number and a lass of 2 in atomic number
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Chemistry Unit II Study Guide - Unit 2 Atomic Theory and...

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