1. Ch. 6 Notes-Pre AP Chemistry Periodic Table and Periodic Law John Newlands – when elements arranged by increasing mass, properties repeated every 8 th element -Called law of octaves -Not widely accepted for years  Dmitri Mendeleev – grouped elements by similar properties and by mass– first periodic table - Also noticed a “periodic” repeating of patterns of the elements

2. -He also predicted the properties of some yet undiscovered elements (left blank spaces in the table for them)  Henry Moseley – arranged elements in order of increasing nuclear charge (number of p + ) – atomic number

3. Periodic Law – periodic repeating of chemical and physical properties of elements when arranged by atomic number Modern Table -Groups – columns (numbered 1-18) -Periods – rows (numbered 1-7) -Representative elements – s and p block elements; they possess a wide range of chemical and physical properties -Transition elements – d block

4. Inner Transition Elements – f block - divided into lanthanides (58-71) and actinides (90-103) Classifying Elements 1) Metals – shiny, good conductors of heat and electricity, solid at room temp., malleable (bendable), ductile (wires) - Left of the stairstep - Alkali metals – group 1 (except H) - Alkaline earth metals – group 2 - Both groups very reactive

5. 2)Nonmetals – usually gases or brittle solids, poor conductors -Right of the stairstep -Halogens – group 17 (highly reactive) -Noble Gases – group 18 (unreactive) 3)Metalloids – physical and chemical properties of both metals and nonmetals -Used in computer chips and solar cells -Found on the stairstep (B, Si, Ge, As, Sb, Te, Po, At