gen chem exercise - General Chemistry ABCT240 Dr Michael...

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General Chemistry Dr. Michael W.-Y. Yu ABCT240 1 Questions for Discussion [1] When 58.4 nm radiation from a helium discharge lamp is directed to a sample of krypton, electrons are ejected with a velocity of 1.59 × 10 6 m s -1 . The same radiation ejects electrons from rubidium with a velocity of 2.45 × 10 6 m s -1 . (a) What are the ionization energies (in eV) of the two elements, and account for any difference in values. (b) Calculate the ionization energies of an H atom with its electron in the same orbitals as in krypton and rubidium and account for the differences in values. [2] (a) The second ionization energies of some Period 4 elements are Ca Sc Ti V Cr Mn 1145 1235 1310 1365 1592 1509 kJ mol -1 Identify the orbital from which ionization occurs and explain the trend observed (b) The atomic radii of Group VI transition metal elements are Cr Mo W 129 140 141 pm Write the ground state electronic configurations for Cr and Mo, and account for the observed trend of values.
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