CHEM110Ch2Answers

CHEM110Ch2Answers - Chapter 2: 13, 15, 33, 45, 46, 47, 48,...

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Chapter 2: 13, 15, 33, 45, 46, 47, 48, 49, 50, 53, 59, 73 13. Lower number is the atomic number (# protons) and upper value is the mass number (protons+neutrons) He = 2 protons and 3-2 = 1 neutron He = 2 protons and 4-2 = 2 neutrons Mg ଵଶ ଶସ = 12 protons and 24-12 = 12 neutrons Mg ଵଶ ଶହ = 12 protons and 25-12 = 13 neutrons Ti ଶଶ ସ଼ = 22 protons and 48-22 = 26 neutrons Br ଷହ ଻ଽ = 35 protons and 79-35 = 44 neutrons Pt ଻଼ ଵଽହ = 78 protons and 195-78 = 117 neutrons 15. The symbol is given by the atomic number (Z) a. Na ଵଵ ଶଷ b. Ni ଶ଼ ଺ସ 33. A positive ion loses electrons, and a negative ion gains electrons. the proton # are assigned by the element chosen, and does not change when an ion is formed. Ion Protons (=atomic #) Electrons Na + 11 10 Ca 2+ 20 18 Al 3+ 13 10 Fe 2+ 26 24 I - 53 54 F - 9 10 S 2- 16 18 O 2- 8 10 N 3- 7 10 45. Metal+nonmetal = ionic compound two nonmetals = molecular compound SiCl 4 = molecular LiF = ionic BaCl 2 = ionic B 2 H 6 = molecular
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CHEM110Ch2Answers - Chapter 2: 13, 15, 33, 45, 46, 47, 48,...

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