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Atomic Structure, Periodic Table, Compounds and Mixtures Study Guide

Objective 8.P.1.1 & 8.P.1.2

Teika Clavell

on 5 October 2012

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Transcript of Atomic Structure, Periodic Table, Compounds and Mixtures Study Guide

8.P.1.1 & 8.P.1.2 Atomic Structure, Periodic Table, Compounds and Mixtures Study Guide Alkali Metals- group (family) one, one valence electron, very reactive. Sodium (Na) & Potassium (K) very reactive metals, reacts with group (family) 17; Halogens
Alkaline Earth Metals- group (family) two, two valence electrons, less reactive than group (family) one
Transition Metals- groups 3-12, less reactive than other groups other than group 18; Noble gases, malleable, ductile, shiny, conducts electricity and heat
Metalloids- are along the "staircase", conduct electricity in certain conditions, i.e.; have properties of both metals and non-metals
Halogens- group (family) 17, most reactive group of the periodic table, non-metals, seven valence electrons, very reactive with group 1 & 2
Noble gases- group (family) 18, inert meaning they are non reactive, all gases Families on the Periodic Table
Elements in same group (family) have similar properties Compounds- pure substances, made of elements that are chemically combined Compounds & Mixtures Identifying numbers of elements versus number of atoms A compound can be made of the same elements and have different properties; it all depends on the amount or ratios of those elements Water is a compound Elements can be identified by their reactivity when chemically combined in a compound Mixture- matter made up of two or more substances that are not joined chemically they are physically combined Heterogeneous mixtures contain parts that are not distributed evenly (i.e., oil and water) Homogeneous mixtures are the same throughout; evenly distributed (i.e., skim milk). Gases combined are homogeneous. Identifying numbers of elements versus number of atoms Atoms are represented by the numbers known as subscripts
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