a. Chromium has four naturally occurring isotopes: 4.34% of 50Cr, with an atomic weight of49.9460 amu; 83.79% of 52Cr, with an atomic weight of 51.9405 amu; 9.50% of 53Cr,with an atomic weight of 52.9407 amu; and 2.37% of 54Cr, with an atomic weight of 53.9389 amu. On the basis of these data, what is the atomic weight of Cr?
b. Give the electronic configurations for the following: Fe2+, Al3+, Cu*, Al, Ba2+, Br, 02,Fe3+, Cr and S². Briefly justify how you get to the final electronic configurations using appropriate diagrams or sketches.
c. A cylindrical metal specimen 13 mm in diameter and 240 mm long is to be subjected to a tensile stress of 30 MPa; at this stress level, the resulting deformation will be totally elastic.
i.If the elongation must be less than 0.085 mm, which of the metals in table Q1c below are suitable candidates? Why?
If, in addition, the maximum permissible diameter decrease is 1.5 X 10-3 mm when the tensile stress of 30 MPa is applied, which of the metals that satisfy the criterion in part (i) are suitable candidates? Why?
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