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THE PERIODIC TABLE Topic 5 Scientist to know Dmitri Mendeleev A Russian chemist He built the periodic table. How? He made element cards with data about each element He pinned them all to the wall in order of increasing atomic mass He left gaps in the periodic table for elements to still be discovered He predicted the existence and physical properties of the missing elements because the elements follow a pattern. Gallium and germanium were discovered shortly after. This is an example of experimental evidence confirming a scientific prediction. http://www.youtube.com/watch?v=fPnwBITSmgU&li st=PLJicmE8fK0Ehrg3meytY7DT8LJiwuU3Th&index =96 The genius of Mendeleev's periodic table - Lou Serico Groups and Periods Vertical columns are called groups Horizontal rows are called periods http://www.youtube.com/watch?v=zGM-wSKFBpo Element song animated http://www.youtube.com/watch?v=uJGrwWOWt3Q&feature=relate d First 10 song Each element http://periodictable.com/PosterVideo/GrowingFromGrid/GrowingFromGrid800x480WithSound .mov The charge an atom becomes after it has given or taken e-s Number of protons Either the first letter of the name, first two letters of the name, two letters from the name, or letters from the Latin name. Given by the person who discovered it. Mass of the protons + mass of the neutrons Each proton and neutron has an approximate mass of 1 amu or g/mol # neutrons = atomic mass – atomic number Round each atomic mass to the nearest whole number Amu = atomic mass unit g/mol = the mass of 1 mol of atoms 1 mol = 6.02 x 1023 atoms Assignment 1. 2. 3. Element Symbols Using the Periodic Table *back page Chemistry Dictionary – up to Topic 5