Oxygen is the most important element in the periodic table, it's symbol is O . Oxygen is colorless and odorless, it was found in 1774 by a man named Joseph Priestly, the origin of the name oxygen comes from the Greek words oxus (acid) and gennan (Generate). Oxygen has a very important role in t...

Thorium, symbol Th, is a radioactive metal like element with a atomic number of 90. It is part of the actnide series of the periodic table. Thorium was discovered in 1828 by Baron Jons Jakob Berzelius, a Swedish chemist.Its is ranked 39 in quantites of elements in the earths crust....

Alchemy Alchemy is an ancient art, practiced in the Middle ages,used to discover a substance that would transmute common or base metals into gold or silver ,and to find a way of prolonging human life.The main objective of alchemy was to discover a substance called the philosopher's stone.This ston...