I originally reviewed What Color Is Your Parachute? in five parts, which you can find here, here, here, here, and here if you would like to read the original comments. What Color Is Your Parachute? is the eighteenth of fifty-two books in The Simple Dollarâs series 52 Personal Finance Books in 52 Weeks.
Thallium is extremely soft, malleable and sectile enough to be cut with a knife at room temperature. It has a metallic luster that, when exposed to air, quickly tarnishes to a bluish-gray tinge, resembling lead. It may be preserved by immersion in oil. A heavy layer of oxide builds up on thallium if left in air.
Naturally-occurring thallium is composed of two stable isotopes, thallium-203 and -205. 23 radioactive isotopes have also been been synthesized.he Thallium atom has a radius of 170.pm and its Van der Waals radius is 196.pm. In its elemental form, CAS 7440-28-0, thallium has a silvery white appearance. Thallium was first discovered by Sir William Crookes in 1861 and gets its name from the Greek word thallos which means twig or green shoot.