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QOD What can you do today to be more successful? (three sentences) 1) Right your agenda 2) Answer the QOD on your own sheet 3) Get out your notesheets. What does each square contain? What is The Atomic Number ? The number of Protons in an ATOM. Where is The Atomic Number on the periodic table ? The number of Protons in an ATOM. What is The Atomic Mass ? The average number of Protons plus the average number of NEUTRONS in an ATOM. Where is The Atomic Mass on the periodic table ? The number of Protons in an ATOM. Where is The Atomic Symbol on the periodic table ? The number of Protons in an ATOM. How many letters does an Atomic Symbol have? Either one or two. If it has two letters, the first letter is capitalized and the second is lower case. The Periodic Table What is the Periodic Table? a) It is a method of organizing the elements. b) It is a chart of the elements showing the repeating patterns of their properties. c) A Russian named Dimitri Mendeleev is credited with its creation in 1869. How was the periodic table created? a) Mendeleev wrote each element’s melting point, density, color, and atomic mass on individual cards. b) He arranged similar cards in groups by increasing atomic mass. c) He eventually arranged elements into groups by similar properties instead of by atomic mass. Dimitri Mendeleev Mendeleev’s Periodic Table How is the Periodic Table arranged? a) The elements in the periodic table are arranged by atomic number. Atomic numbers increase from left to right. b) It is also arranged by classes of elements – metals, semimetals, nonmetals, and inert gases. c) The periodic table is arranged in horizontal rows called periods. d) The vertical columns are called groups. What is a Period? a) A period is a horizontal row of elements that contains a series of different elements. b) The properties of the elements change from left to right. Metals are on the left, semimetals in the middle, nonmetals on the right next to the inert gases. c) There are 7 periods. Period 1 has 2 elements, periods 2 & 3 have 8, periods 4 & 5 have 16, period 6 has 32. What is a group? a) The vertical columns are called groups. b) A group is also called a family. c) Elements in a group have similar characteristics. For example, elements in group 1 react violently with water while elements in group 2 react very slowly or not at all. d) There are 18 groups. Lanthanides and actinides do not belong in these groups. Homework: 10-24 Insert