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CHEMISTRY 121 1 Department of Chemistry University of British Columbia Problem Set 2 The Atom, Periodic Trends and s-Block Elements 1. Calculate the atomic mass of a sample of naturally occurring boron which contains 19.9% B 10 5 and 80.1% B 11 5 . 2. Determine the number of valence electrons for the following elements: Na, Ca, P, Se, I, Xe, O, and Sb. 3. In which of the following groups are all the species isoelectronic? (a) Mg + , Na, Ne (b) Br - , Rb + , Sr 2+ (c) K, Ca + , Cl - (d) Be 2+ , He, Li + (e) Ba 2+ , Xe, I - 4. Consider the following atoms: Cs, Ba, S, F, and Ne to answer the following questions. (a) Which has the largest radius? (b) Which releases the greatest energy when an electron is absorbed? (c) Which has the greatest first ionization energy? (d) Which has the smallest ionization energy? 5. Rank the following ions in order of increasing ionic radius. Be 2+ , O 2- , F - , Na + , Mg 2+ 6. You are given samples of Na, Mg and Cs but are not told which sample is which. Using only moist air, liquid water and aqueous acid as reagents, how would you
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