Periodicity

A. Periodic Table

1. Comprehensive Periodic Table http://ptable.com/

2. Evolution of Mendeleev's periodic table https://www.youtube.com/watch?v=O-48znAg7VE

B. Periodic Trend

1. Halogen Displacement Reaction Animation http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/patterns/groupsrev5.shtml

2. Ionic radius Animation http://ibchem.com/IB16/05.22.htm#a4

C. Periodicity and Bonding

1. Predicting bonding type using electronegativity; Explaining Polar vs Non-polar Covalent Bond https://chem.libretexts.org/Courses/University_of_Arkansas_Little_Rock/Chem_1402%3A_General_Chemistry_1_(Belford)/Text/8%3A_Bonding_and_Molecular_Structure/8.7%3A_Bond_Polarity_and_Electronegativity_(%5C(%5Cchi%5C))