The shape of a cresent half etc moon can act as a compas in the sky. The mental exercise is good for education but in real life it turns out to be a valuable tool http://lessonpeer.com/drhillteach/Navigate%20with%20the%20Moon.mp4

Very coy about the electron affinity of Cl, and only a half reference to Electro negativity http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20Halogens%20F%20Cl%20Cr%20I%20As.mp4

Should be labled non metals excluding the Halogens and Noble gases. I didn't know about the alotropes of sulphur http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20Non%20Metals.mp4

Tin becoming crystaline / non metalic at low temperature is interesting. Bisimuth what a gift of an element under carbon. Interesting to find it used in thermoelectric devices http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20P%20-%20metals%20Al%20Ge%20In%20Tl%20Sn%20Pb%20Bi.mp4

This is where the idea of element properties is taken to far to explain bulk crystal properties in painful science. Amphoteric is a new term, but it may well be best left in this book http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20P%20-%20Metaloids%20B%20Si%20Ge%20As%20Sb%20Te%20Po.mp4

An amazing mistake with Rhenium given as Rh rather than Re. Talking more about the symbols and atomic number http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20Transitions%20-%20the%20rest.mp4

I would have approached this differently. Covers Be Mg Sr Ba and Ra, so much more to tell. The explanation of why metals are metalic because they have metalic bonds is typical http://lessonpeer.com/drhillteach/Theordore%20Gray%20Elements%20-%20Group2.mp4

titanium, zirconium, hafnium, tungsent http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20Transitions%20Ti%20Zr%20Hf%20W.mp4

This podcast covers the common transition metals you would expect to hear about everyday. http://lessonpeer.com/drhillteach/Theodore%20Grays%20Periodic%20Table%20Transitions%20Cu%20Ar%20Au%20Hg%20Fe%20Zn%20Pt%20Pt-group%20.mp4

Lets look back over the main ideas of this book I have just read http://lessonpeer.com/drhillteach/Thoughts%20on%20Maths%20after%2013%20episodes.mp4