CHM 2353 Lecture Notes - Lecture 3: Ionic Radius, Unpaired Electron, Covalent Radius
7 Nov 2017
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Document Summary
Classi ed elements in ascending order of their atomic mass with atoms with similar properties listed one above the other, forming a family. Left blank boxes that were lled as the corresponding elements were discovered. Was even able to predict the existed and properties of gallium, scandium, and germanium through the voids in its table. Noble gases: a new family was created in the periodic table in 1894 following the discovery of argon by william. 1913: henry moseley discovers electron and atomic number is more important than providing atomic mass properties. Identi ed from left to right by a number 1 - 8 or by roman numerals followed by a or b (b refers to transition elements) Can be easily shaped (malleable) and drawn (ductile) The border that separates metals from non-metals. Some properties similar to non-metals, but are poor conductors of heat an electricity - they do conduct, just not well. Shiny and soft metals with low melting points.
