Chapter 2

🧂 Elements 11 to 20

The third row runs from sodium to argon, and the fourth begins with potassium and calcium. Here are the two halves of table salt, the metal of drinks cans, the element at the heart of every computer chip and the mineral that makes your bones hard. Watch the symbols: sodium is Na and potassium K, from their old Latin names, natrium and kalium. Two more cards ask which family a set of elements belongs to.

12 cards