26Aluminum
Aluminum used to be one of the most expensive metals in the world. Only the wealthiest ate with aluminum utensils, while lesser nobility ate with gold.
27. Beryllium, the 4th element on the periodic table, is rarely used by chemists. However, because it is light and strong, it is used in aircraft and cell phones. It is also highly toxic. Just 1/4 milligram (mass of a grain of salt) can kill a rat.
28. There’s enough gold in Earth’s core to coat its surface in 1.5 feet of the stuff.
29. Molybdenum is an essential element for mammals (you need it to live) and Molybdenum is also present within human tooth enamel and may help prevent its decay.
30. Tungsten is a naturally radioactive element, but its isotopes half-lives are so long it is considered stable.