CHE 2A Lecture 14: The Periodic Table & Periodic Properties of Elements and Compounds
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CHE 2A Full Course Notes
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Che2a lecture 14 the periodic table; periodic properties of elements and compounds. Periodic law concept: elements show recurring properties according to increasing atomic mass, arranging elements according to increasing nuclear charge, atomic number, rather than atomic mass, explained their repeating properties more accurately. Inner transition metals: f-block elements (lanthanides, actinides) Metals: good conductors of heat and electricity, malleable, moderate to high melting points, most elements are metals. Nonmetals: not conductors of heat and electricity, brittle solids rather than malleable solids, some nonmetals are gases at room temperature. Atomic radius: defined in terms of internuclear distance, determined by experiment, measure of the size of the atom, periodic property, several types, covalent radius, van der waals radius, metallic radius. Bond length (l: the distance between two nuclei within a molecule joined by a single covalent bond. Covalent radius: one half the distance, l, between the nuclei of two atoms joined by a single covalent bond within the molecule, the bond length.
