1. 17.3 The Periodic Table

3. Periodic Table Periodic-repeating pattern 115 elements in 2004
Changing-man made elements
92 naturally occurring (others man made/nuclear) (Anything above 92)

4. Organization Mendeleev-1st based on mass Today-based on atomic #
Groups-vertical columns- same family=Valence Electrons-electron dot diagram
Periods-horizontal rows=energy levels-electron configuration

5. Element Classification 3 types
Metals-
Nonmetals-
Semiconductors-Metalloids

6. Metals
1.) Alkali metals-soft, shiny, most reactive (easy to lose the 1 V. electron, cation) GROUP 1 not found in element form in nature
2.) Alkaline Earth Metals- malleable, ductile. Reactive: Group 2 V. electrons not found in element form in nature
Ca- bones, shells, limestone,
Mg- airplanes, Epsom salt.

7. Metals cont…
3.)Transition Metals-less reactive, conduction of heat/electric, shiny
Au (gold), Ag (silver), Pt- Jewelry
Cu (copper) –plumbing/wires
Fe (Iron), Co (Cobalt), Mn (Manganese)-essential nutrients
W (Tungsten)-light bulb filiments
Technetium & Promethium-synthetic, radioactive

8. Inner Transition Metals: (f orbital)
Lanthanides-top 58-71
Actinides-bottom Radioactive-unstable

9. Non Metals Except for Hydrogen, Non Metals on right side of Table
C-graphite/diamond, IMPORTANT ELEMENT
Plentiful on Earth
Halogens-Group 17
Cl-kill bacteria
Fl-poison, toothpaste
Br- liquid
I- table salt, tyroid gland

10. Noble Gas Group 18 Exist as single atoms, not molecules Non-reactive
He-light, balloons
Ne-lights
Ar-light bulbs

11. Semiconductors Diagonal row on right Metalloids/semi conductors
B-HARD Steel
Si-sand, computers
Sb- Poisonous