periodic table

10 videos
1 skill
4E: A little more than a century ago, the chemist Dmitri Mendeleev published an early form of the periodic table, which organizes the known elements of our world by ionization energy and electron affinity. His method of classifying the elements was so useful that we still use it even today. We will learn to apply this elegant table to an understanding of atoms and molecules in this tutorial. Hydrogen, helium, lithium, beryllium, boron, carbon…

Periodic table questions

Questions pertaining to Periodic Table

Electronegativity and bonding

VIDEO 11:39 minutes
Electronegativity differences in bonding using Pauling scale. Using differences in electronegativity to classify bonds as covalent, polar covalent, or ionic.

The periodic table - classification of elements

VIDEO 8:56 minutes
Common terms describing the ways elements are classified in the periodic table.

The periodic table - transition metals

VIDEO 5:34 minutes
The definition of a transition metal, and how to write the electron configuration including examples for Fe and Zn.

The periodic table - valence electrons for main group

VIDEO 8:19 minutes
How to determine the number of valence electrons and draw Lewis structures for main group elements starting from the electron configuration.

Atomic and ionic radii

VIDEO 11:26 minutes
Explaining group and period trends in atomic and ionic radii.

Group trend for ionization energy

VIDEO 10:19 minutes
Explaining trend in ionization energy down a group using concepts of nuclear charge, electron shielding, and distance of electrons from nucleus

Period trend for ionization energy

VIDEO 12:54 minutes
Explaining trends in ionization energy across a period using nuclear charge, shielding, and distance of electrons from nucleus

First and second ionization energy

VIDEO 7:35 minutes
Comparing first and second ionization energy of Li using nuclear charge, shielding, and distance of electrons from nucleus

Electron affinity

VIDEO 11:40 minutes
Definition of electron affinity, and comparing electron affinities of Li, Be, and B

Period trend for electron affinity

VIDEO 7:28 minutes
Explaining general trends in electron affinity across the second period, including the exceptions N and Ne