Khan Academy (English - US curriculum)
Science & Engineering
Chemistry
Periodic table
Periodic table trends
Periodic table trends
Periodic trends
Atomic radius trends on periodic table
Atomic and ionic radii
Mini-video on ion size
Ionization energy trends
Ionization energy: period trend
First and second ionization energy
Electron affinity: period trend
Electronegativity
Electronegativity and bonding
Metallic nature
Periodic trends and Coulomb's law
Worked example: Identifying an element from successive ionization energies
Ionization energy: group trend