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Periodic Table (Groups, Periods, Symbols) duration 6 minutes 19 seconds Periodic Table (Groups, Periods, Symbols) Periodic Table (Groups, Periods, Symbols)	Periodic Table (Groups, Periods, Symbols) Atomic number, protons, columns, rows. Question: What do we see when we look at an element on the table? periodic table groups periods symbols chemistry chem chem 101 101 From tutoringcenter 0 likes 46 plays 0
$Thumbnail for entry Refractory Periods$ Refractory Periods duration 3 minutes 26 seconds Refractory Periods Refractory Periods	Refractory Periods What is the refractory period? Respiration Regulation refractory periods anatomy physiology biology bio 264 From tutoringcenter 0 likes 28 plays 0