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Discovery of phosphorus
German merchant and amateur Alchemist Henning brand attempted to create an object that could turn metals into gold. He heated residues from boiled urine, and a liquid dropped out and burst into flames. -
Phosphorus becoming public
Robert Boyle also discovered phosphorus and it finally becomes public. -
47 elements
At least 47 elements were discovered, and scientists began to see patterns in characteristics. -
John Newlands
English chemist John Newlands discovered 56 elements & divideded them into 11 groups, based on characteristics. -
Dimitri Mendeleev
Russian chemist dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements and left spaces open on the periodic table. -
Radioactivity
French physicist Antoine Bequeral first discovered radioactivity. Thomson student from New Zealand Ernest Rutherford named three types of radiations; alpha, beta, & gamma rays. Which also discovered that beta particles were negatively charged. -
Noble gases
Sir William Ramsey & lord Rayleigh discovered the noble gases, which were added to the periodic table as group 0. -
Electrons
English physicist J. J. Thomson 1st discovered electrons; small negatively charged particles in a atom. John Townsend & Robert Millikan determined their exact charge and mass. -
Electrons and beta particles
Bequeral discovered that electrons and beta particles are identified by the curies are the same thing -
Breakdown of atoms
Rutherford announced that radioactivity is caused by the breakdown of atoms
