Question : In 1931, who recognised that an aromatic compound must have an odd number of pairs of electrons, which can mathematically be written as 4n+2 (n = 0,1,2,3 etc.)?

Question : Which French chemist was one of the first scientists to synthesise organic compounds such as formic acid, methane and acetylene from their elements?

Question : In 1845, which German chemist published a method for the synthesis of acetic acid, a natural product containing two carbon atoms?

Question : Electrons in the highest energy level of an atom are called ________.

Question : In the early 1800s, who discovered that each chemical element is made up of a unique type of atom and that atoms differ by their mass?