THE PERIODIC TABLE Chemistry 112

The First Five Minutes… Make a table with five columns In the first column, write the following metals into each space: lithium, sodium, potassium, rubidium and cesium Title the other columns: atomic number, melting point, boiling point and density Use table B.2 in Appendix B to complete the table Do the same thing for the following nonmetals: fluorine, chlorine, bromine, and iodine

The Organization of the Elements Chemists organize the elements into groups based on chemical properties Mendeleev organized the elements into a table based on increasing atomic mass However, when more elements were discovered, his method was not practical As a result, the modern periodic table is arranged based on increasing atomic number

The Modern Periodic Table The elements found in the same group share chemical properties The properties of elements change as you move across a period The pattern of change repeats from one period to the next Periodic law states that when elements are arranged in order of increasing atomic number, there is periodic repetition of their physical and chemical properties

Metals, Nonmetals and Metalloids Periods and groups are one way to classify elements Metals are found on the left side of the staircase  Good conductors of heat and electricity  Mostly solid at room temperature  Shiny, malleable, ductile Nonmetals are found on the right side of the staircase  Poor conductors of heat and electricity  Dull, brittle Metalloids border the staircase

For the remainder of class… Complete the guided reading for section 6.1 Questions 1 – 7, page 160 Section Review 6.1 Classification of the periodic table – periods, groups, metals, nonmetals, metalloids, staircase, title, state of matter