BIOL 2299 Lecture Notes - Bromine
18 Mar 2014
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Document Summary
Classification of elements: the periodic table is organized to help predict possible bond formations, volatile high tendency to vaporize, metals, malleable ability to bend, ductile can be stretched out into wires, electrical conductivity. Sea of electrons: heat conductivity, luster, high melting and boiling points, ten to lose electrons to form cations (chemical property, nonmetals, low boiling points. Many gases at room temperature: not malleable or ductile, dull, no luster, tendency to gain electrons to form anions (chemical property, not electrically, thermally conductive, metalloids the medium between metals and nonmetals, tend to form covalent bonds with other atoms, not very malleable, ductile, or conductive, diatoms, all are nonmetals, homonuclear diatomic molecules. O2: compounds are classified by the bonds they contain, covalent bonds where electrons are shared by two atoms, they stay together, because the attractive forces are stronger than the repulsive forces, ionic bonding attractions between oppositely charged particles, anions and cations attract each other.
