Do now: Sit with partners Take out HW Take out Periodic Table Scavenger Hunt

Common characteristics Metals Few electrons in outer energy level Solid at room temp Hg is liquid at room temp Good conductor of heat/electricity Shiny Malleable Nonmetals Not malleable/ductile Not shiny Poor conductors of heat/electricity Metalloids Shiny/brittle Hard Good conductors of heat/electricity 1/2 of complete set of electrons in outer level Properties of metals & nonmetals

Zig-zag reminds you where metals, nonmetals, and metalloids are Metals= BLUE Metalloids= GREEN Nonmetals= YELLOW

Liquids (2) Mercury Bromine Gases (11) Nitrogen Oxygen Fluorine Neon Helium Chlorine Argon Krypton Xenon Radon Hydrogen

Radioactive 31 elements #'s #'s & 61 Lanthanides & Actinides Removed to allow the table to be narrower

Three letter symbols Are temporary Based on atomic #'s of the elements Official names and symbols will be approved by international committee of scientists Rows= Periods Columns= Groups/Families

Mendeleev VS Moseley Mendeleev Discovered a pattern to the elements 1869 Wrote names and properties of the elements on cards Arranged these by diff. Properties Density Appearance Melting point Arranged by increasing atomic mass Moseley Determined number of protons (Atomic number) in an atom Rearranged the PD Table by increasing atomic number

Chemical/Physical Properties Definitions Posted on Assignments Tab Chemical Forms a new substance during a reaction such as: Rusting of iron Physical Can be observed or measured such as a transformation between phases: gas to liquid to solid