Periodic Table of Elements (1 to 12)

In this science talk for bedtime, I review the periodic table of the elements methodically and explain in simple terms plenty of phenomena and concepts about chemistry and physics (for example, in this episode: the structure of atoms, valence and reactivity, isotopes, allotropes, ionic compounds, the definitions of metals...) as well as the industrial and economic relevance of some of these elements. For tonight, we begin with the first twelve elements: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, and magnesium.