CHEM 208 Lecture Notes - Lecture 3: Covalent Bond, Alkali Metal, Nonmetal
20 Sep 2016
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Document Summary
Module 3: the periodic table and naming compounds: the groups are designated with the numbers 1 (i) to 8 (viii) and a letter a or b. The elements in the groups with the letter a designation are referred to as the main-group elements and those with the letter b designation as the transition elements. Elements in the same group (or family) have similar chemical properties. Alkali metals (group 1a) alkaline earth metals (group 2a) halogens (group 7a) noble (rare, inert) gases (group 8a) The periods (horizontal rows) are designated with numbers 1 to 7. Physical states of elements include: solid liquid gas. Metals lose electron(s) to form cations and the nonmetals gain electron(s) to form anions. The elements are classified as: metal nonmetal metalloid (semi-metal) Esstential elements the elements h, na, mg, k, ca, c, n, o, p, s, cl are the most abundant in living systems and are essential for life.
