CHEM 1000 Chapter Notes - Chapter 9: Diamagnetism, Dmitri Mendeleev, Julius Lothar Meyer
8 Sep 2016
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In 1869, dmitri mendeleev and lothar meyer proposed the periodic law: when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically. Nonmetals are at the right of the periodic table + noble gases (metalloids are in between metals and non-metals) group 15, 16, 17 are non metals. The e- are lost from these metals differently than the aufbau principle suggests, they lose the s orbital first or they often lose d orbital e- to give half filled d shell which is stable. Half the distance between identical atoms in a covalent compound. Determined from separation between ions joined by ionic bonds. Half the distance between metal atoms in crystalline solid. Cations (+) are smaller than the atoms from which they are formed. Anions (-) are larger than the atoms from which they are formed. Atoms with a higher nuclear charge (zeff) are smaller.
