55:20
Alkali metals
Much less dense than most other metals, alkali metals are also extremely chemically reactive. Segments in this program include Exploring Alkali Metals (properties of the alkali metals); Lithium: Aircraft Alloys (why lithium is an ideal partner for a...
26:13
Metals
On the periodic table, three-quarters of all the elements are classified as one sort of metal or another. Divided into five sections, this program provides a thorough overview of metals: Metals in Our World (includes iron, lithium, magnesium, mercur...