Bohuslav Brauner, a Czech chemist predicted the existence of promethium in 1902. … They discovered promethium while examining the byproducts of uranium fission in a nuclear reactor at the Oak Ridge National Laboratory. The IUPAC named the element as promethium in 1949 after the Greek Titan Prometheus. Who discovered promethiumRead More →
halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts). Which group in the periodic table is known as self formers? The chalcogens (ore forming) (/ˈkælkədʒənz/Read More →
But within 100 years of the appearance of Mendeleev’s Periodic Table, it is thought that around 700 different versions were published, all taking many shapes and forms in different dimensions, from spirals, cylinders and rings, to fractals and pyramids. What is the difference between the old and new periodic table?Read More →
Lead was one of the first metals known to man. … Lead’s symbol Pb originates from its Latin name, plumbum — which actually used to refer to soft metals more generally. What is lead used for now? Lead is still widely used for car batteries, pigments, ammunition, cable sheathing, weightsRead More →