CHM110H5 Quiz: Atomic and Molecular structure
Document Summary
Observations to be made about a chemical reaction. Doberiener"s triads (1829) - organized groups of three. First elements cl, br, i (similar grouping in the modern) Classifying element in groups of three that have similar properties and reactions. Fe, co, ni (did not have similar atomic masses in comparison to the others) Put them in order of increasing atomic mass and set them in groups of 8. Inert gasses are not there; yet to be found. Co, cu, zn, y, in, as, se (no longer viable) And where the mass did not fit he left spaces. Fe, ni, <=> co, cu (transitional elements, it is the number of protons and electron that determines the properties of an element thus it has to put into order of increasing atomic number. Te and i it was in the reverse order. Isotopic abundances: ar (the heaviest one is the most abundant) (39. 948 avg. )
