1. Electron Configuration & The Periodic Table Chapter 12

2. Groups & Periods  Group – vertical column on the periodic table; share similar chemical properties  Period – horizontal rows on the periodic table; give the energy level of the outer electrons  Period 1: H: 1s 1 He: 1s 2  Period 3: Li: [He]3s 1 N: [He]3s 2 3p 3

3. The Blocks  The periodic table is divided into 4 blocks corresponding to the type of orbital of its outer electrons 1) s-block (groups 1-2) 2) p-block (groups 13-18) 3) d-block (groups 3-12) 4) f-block (Lanthanides & Actinides)

4. Blocks & e - configuration  Example---need to know Ca configuration  Ca is located in the s-block, on the 4 th period, and the 2 nd column  Using the noble gas that comes before Ca, we can now write Ca configuration just using this info  Ca: [Ar]4s 2

5. More practice  Oxygen [He]2s 2 2p 4  Vanadium [Ar]4s 2 3d 3 **Watch for d-block, it will always be one less than your row #!

6. S-Block (Groups 1 & 2) Group 1 is most reactive – Alkali Metals  Has configuration of ns 1  Silvery appearance, but soft Group 2 --- Alkali Earth Metals  Has configuration of ns 2  Harder, denser, stronger; less reactive

7. Group 1 and 2 Reactions!

8. The d-block (groups 3-12)  Elements are known as transition metals  Good conductors of electricity & heat  High luster (shiny) and reactivity decreases as group # increases  Configuration (n-1)d x ns y  http://www.chemicalelements.com/groups/ transition.html http://www.chemicalelements.com/groups/ transition.html http://www.chemicalelements.com/groups/ transition.html

9. P-block (groups 13-18)  Known as the main group elements  Configuration of ns 2 np x  Include metals, nonmetals & metalloids  Group 16—Chalcogens; purify metals  Group 17—Halogens; react vigorously with metals  Group 18—Noble Gases; inert

10. F-block  Lanthanides– shiny metals similar with group 2 reactivity  Actinides– all radioactive; only the first 4 are found naturally on Earth; the others only in labs  http://video.google.com/videoplay?docid=7278951 069225366106&q=atomic+bomb&hl=en http://video.google.com/videoplay?docid=7278951 069225366106&q=atomic+bomb&hl=en http://video.google.com/videoplay?docid=7278951 069225366106&q=atomic+bomb&hl=en  http://www.youtube.com/watch?v=-L2pyTn1O00 http://www.youtube.com/watch?v=-L2pyTn1O00