Periodic Table December 18, 2007. Mendeleev came up with the first periodic table. It was based on the atomic masses, instead of atomic numbers.
Fig. 2-1. Fig. 2-2a Cedrela sapling Duroia tree Inside, unprotected Devil’s garden Inside, protected Insect barrier Outside, unprotected Outside, protected.
Elements and the Periodic Table. Patterns of Elements - The Periodic Table During the 19th century, chemists identified families of similar elements (e.g.
Anatomy of an atom In the 1910s Ernest Rutherford and Niels Bohr devised a model for the atom. Electrons – electrically negative – surround a positive.
Exam Specifications Mathematics15% Engineering Probability and Statistics7%
