Periodic properties

Variation in physical properties - conductors and insulators: 

http://www.physics4kids.com/files/elec_conduct.html


http://hyperphysics.phy-astr.gsu.edu/hbase/electric/conins.html


http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/conductorsinsulators.htm

Reaction of alkali metals with water:

http://www.youtube.com/watch?v=uixxJtJPVXk&feature=related

Reaction of sodium with chlorine:

http://www.youtube.com/watch?v=Ftw7a5ccubs

Reaction of some metals with oxygen:

http://www.youtube.com/watch?v=hQyJIxiSvUA&NR=1

Reactivity of halogens:

http://www.youtube.com/watch?v=u2ogMUDBaf4

Precipitation reactions:

http://www.youtube.com/watch?v=8RmVwz2fNGc&feature=related