CHM 2353 Lecture Notes - Lecture 3: Electronegativity, Seasonality, Van Der Waals Radius
4 Nov 2017
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Lecture 3: the periodic table and periodic trends. Main group: formed by s and p block. Group 1: the alkali metals: shiny, soft metals, low melting points, react rapidly (often violently) w/ water to form products that are basic (alkaline, never found in nature in pure state, only in combo w/ other elements. Group 17: the halogens: corrosive, non-metallic, all found in nature, but only in combo w/ other elements, halogens commonly form salts (name comes from greek word for salt) Group 18: the noble gases: very low reactivity, he, ne, ar do(cid:374)"t (cid:272)o(cid:373)(cid:271)i(cid:374)e (cid:449)/ a(cid:374)y other ele(cid:373)e(cid:374)ts, kr & xe (cid:272)o(cid:373)(cid:271)i(cid:374)e (cid:449)/ (cid:448)ery few. Transition metals: all except hg are solid at room temp, most have silvery shine, easily shaped (malleable) & drawn (ductile, good conductors of heat & electricity. Non-metals: many (11/17) are gasses at room temp; 1 liquid, others solid, poor conductors of heat & electricity.
