EX Chapter 2 M.ppt

# EX Chapter 2 M.ppt

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Chapter II : Atomic structure and Interatomic Bonding EX : 2.1. Chromium has four naturally occurring isotopes: 4.34 % of 50 Cr, with atomic weight of 49.9460 amu; 83.79 % of 52 Cr, with an atomic weight of 51.9405 amu; 9.50 % of 53 Cr, with an atomic weight of 52.9407 amu; and 2.37% of 54 Cr, with an atomic weight of 53.9389 amu. On the basis of these data, confirm that the average atomic weight of Cr is 51.9963 amu. EX : 2.2. Chlorine has an average atomic mass = 35.45 amu. It’s composed of 2 isotopes 35 Cl and 37 Cl which atomic mass are 35 and 37 respectively. Calculate the relative abundance %ζ 1 and %ζ 2 of these two isotopes. EX : 2.3. An electron can be characterized by three quantic numbers: n, l and m l . Which of the following representation is possible? Justify your answer. a) (2, 2, 1) b) (3, 0, 0)

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EX : 2.4. Allowed values for the quantum numbers of electrons are as follows : n= 1, 2,3… l = 0, 1, 2, 3, …, n-1 m l = 0, ± 1, ± 2, ± 3,…., ± l ms = ± 1/2 For the K shell, the four quantum numbers for each of the two electrons in the 1s state, in the order of nlm l m s , are 100(1/2) and 100 (-1/2).
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