CHEM 205 Lecture Notes - Lecture 3: Diethyl Ether, Valence Electron, Metallic Bonding
20 Feb 2018
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Li tends to mimic he: o tends to mimic ne, cl tends to mimic ar, how: ato(cid:373)s fill thei(cid:396) (cid:448)ale(cid:374)(cid:272)e (cid:271)(cid:455) , 1) sharing electrons (covalent bonding, 2) stealing electrons (forming ions, 3) giving away electrons (forming ions) Broad classification of bonding (reality often in-between): covalent bonding: atoms pull similarly, so share electrons covalent bond between nm & nm (small change in electronegativity, similar pull on electrons) 2. 6 covalent compounds are made of molecules: molecular formula: indicate elements present using symbols, # atoms of each type using subscripts, methane: Isomers: same formula, difference structures: ex: ethanol & diethyl ether; both c2h6o, condensed formula, ethanol: ch3ch2oh, diethyl ether: ch3och3. Bulk physical properties depend on attraction strength between molecule & how molecules pack: ex: oxygen, water, sucrose, network & polymeric substances: no discrete molecules. Covalently bonded atoms are linked together across billions of atoms: ex: diamond, plastic.
