CHEM 104 EXAM #2|Questions with 100% Correct Answers

CHEM 104 EXAM #2|Questions with 100% Correct Answers Periods are horizontal rows(1-7) groups are vertical columns (1A-8A) Metals are 70%, shiny, ductile, heat, electricity Non-metals are dull, brittle, good insulators metalloids are better conductors than non-metals, not as good as metals 3B-12B is transition metals 1A-8A is representative elements Alternative System 1-18 1A alkali metals 2A Alkaline Earth Metals 3A-6A no common names 7A Halogens -1 8A Noble Gases P+ proton: positively charged +1 n neutron, charge is 0 e- electron, An atom consist of a nucleus that contains protons and neutrons -electrons in a large empty space between nucleus Atomic # is also Protons and Electrons isotopes atoms of the same element, but have different atomic mass nucleus that is radioactive radiation Atom smallest particle of an element that retains characteristics of that element representative elements 1A-8A Valence Electrons # of electrons in the outermost energy level Group # gives the # of valence electrons for the representative elements Atomic size increases going down a group atomic size decreases going up from left to right across a period metallic characters the ability to lose electrons -more prevalent in metals -less for nonmetals on the right side of the periodic table, which doesn't lose electrons easily Ionic -forms because of transfer of electrons -solid @ room temp -high melting points -salts, metals, non metals Covalent -forms from sharing electrons -soft and flexible -low melting points -Metalloid and non metals atoms form positively charged ions(cations) when lose electrons atoms form negatively charged ions(anions) when they gain electrons Ionic charges from group # determine charges for ions of elements charge for 1A +1 (except hydrogen) charge for 2A +2 (except Be) charge for 3A +3 charge for 5A -3 charge for 6A -2 charge for 7A -1 3A through 6A Anions, you put "ide" @ end for non metals Elements with variable charges Transition Metals (group B) and Polyatomic Ions Transition metals (group B) form -two or more cations -Zn,Cd, Ag form one cation Sn, Sb, Pb, Bi have variable charges for their cations Polyatomic Ions group of atoms with/ an overall charge consisting of a non-metal such as phosphorus, sulfur, carbon, nitrogen, oxygen, Groups 1A, 2A, 3A are _____ Metals cation Groups 5A, 6A, 7A, are ________ non metals anion Metals that form more than one positive Ion Bismuth, chromium, cobalt, copper, gold, iron Multiple charges for Bismuth Bismuth (III) & (V) Multiple charges for chrominum chromium (II) (III) Multiple charges for cobalt cobalt (II) (III) Multiple charges for copper copper (I) (II) Multiple charges for gold gold (I) (III) Multiple charges for Iron Iron (II) (III) formula for ionic compound 1. write symbol for the metal cation 2. symbol for non metal anion and charge