Ch21_HW-1 - PassaicCountyCommunityCollege...

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Passaic County Community College CH 112 – General Chemistry II Homework Answers – Chapter Twenty-One 21.8 p = protons, n = neutrons, e = electrons; number of protons = atomic number;  number of neutrons = mass number – atomic number (a) 71n   55p,   : Cs 126 55    (b)     1 19 Sn: 50p, 69n (c)     1 41 Ba: 56p, 85n 21.12 (a) Pt       electron)   (orbital   e Au 191 78    0 1 191 79    + -       (b) β 0    1 201 80    201 79    Hg       Au - + (c) e 0    1 198 80    198 79    Hg       Au - +       (d) e Pt       Au 0 1 188 78    188 79    + 21.14 (a) e; Mg       Na 0    1 24 12 24 11 - +  a  β  particle is produced (b) e; Au       Hg 0 1 188 79    188 80    +  a positron is produced (c) e; Xe       I 0    1 122 54    122 53    - +  a  β  particle is produced (d) He; U       Pu 4 2 238 92    242 94    +  an  α  particle is produced 21.18 (a) Ge 66 32 - low neutron/proton ratio, positron emission (b) Rh 105 45    - high neutron/proton ratio, beta emission (c) I 137 53     - high neutron/proton ratio, beta emission (d) Ce 133 58    - low neutron/proton ratio, positron emission 21.28       (a) P p n S 32 15 1 1 1 0 32 16 + + (b)      
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This note was uploaded on 02/06/2011 for the course CH 112 taught by Professor Saf during the Spring '10 term at Passaic County Community College.

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Ch21_HW-1 - PassaicCountyCommunityCollege...

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