1. PERIODIC TABLE ORGANIZATION How is the periodic table organized? What are the properties of each group?

2. HISTORY OF PERIODIC TABLE Dmitriv Mendeleev Arranged elements in order of increasing atomic mass Left gaps of ?

3. MENDELEEV’S PERIODIC TABLE

4. Modern Periodic Table George Moseley Arranged elements in order of increasing atomic number Assigned atomic numbers

5. GROUPS - COLUMNS Run vertically Called families Have similar properties based on the # of valence electrons Patterns emerge as you move

6. PERIODS - ROWS Correspond to energy levels (n) Patterns emerge as you move Periodic Law or Periodicity

7. METALS – METALLOIDS - NONMETALS Grab a book – Turn to pg. 158

8. METALS Most elements (80%) Solids (except Hg) Conductors of heat/electricity High luster/sheen Ductile (drawn into wires) Malleable (hammered into thin sheets)

9. NONMETALS Upper right corner Mostly gas Solids = S, P Liquid = Br Poor conductors Brittle solids

10. METALLOIDS Found touching stair step Properties of both depending on condition EXCEPTIONS = Al and Po

11. GROUP 1 – ALKALI METALS Silvery soft HIGHLY REACTIVE 1 valence e-

12. GROUP 2 – ALKALINE EARTH METALS Still reactive but more stable 2 valence e- Harder, denser, stronger

13. GROUP 7 – HALOGENS or SALT FORMERS Most reactive nonmetals 7 valence e- Form salts (NaCl) Called halides

14. GROUP 8 – NOBLE GASES Do not react Inert, stable gases 8 valence e-, Octet Rule

15. GROUPS 1A  8A REPRESENTATIVE ELEMENTS Wide range of properties Group # = # of valence e- Valence = highest energy level

16. TRANSITION METALS D block INNER TRANSITION METALS F block Lanthanides – shiny metals Actinides – radioactives, lab made