chapter-02

# chapter-02 - CATION(same number of protons/neutrons as atom...

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1331 REVIEW CHAPTER 2 1) Percent by mass of X = [mass of X · 100] / [total mass] 2) History stuff (pp. 47 – 53) – know important people and ideas 3) Structure of Atom particles: name charge mass proton +1 1 neutron 0 1 electron -1 0 Isotopes: same number of protons; different number of neutrons written as mass number symbol – sometimes include atomic number as subscript or symbol-mass number atomic mass = Σ [(mass of isotope n)(% abundance of isotope n)] / 100 Can use fractions: atomic mass = Σ [(mass of isotope n)(Abundance of isotope n)] NOTE: total abundance = 100% or 1 if using fractions 4) Periodic Table : know basic parts (metals, non-metals, metalloids, group names, transition and inner transition metals) 5) Ionic Compounds From metal + non-metal Metal loses electrons –
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Unformatted text preview: CATION (same number of protons/neutrons as atom, less electrons) Non-Metal gains electrons – ANION (same number of protons/neutrons as atom, more electrons) Write formulas: cation then anion – charges must equal Write names: name of cation then name of anion (anion from atom ends in “ide”) KNOW TABLES 2-3, 2-4 and 2-5 VERY WELL!!!! [p. 67 and 69] Oxyanions – know naming rules (p. 70) 6) Covalent Compounds From non-metal + non-metal Binary Compounds: Two elements involved; one further left and down on PT goes first Second element uses “ide” name Use prefixes to indicate how many of each atom (Table 2-6, p. 70) 7) Molecular Mass Add up all atomic masses (don’t forget to use the number of each type of atom!)...
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