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Worksheet_4 - Dr Ramesh Arasasingham WORKSHEET 4 1 a Write...

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Dr. Ramesh Arasasingham WORKSHEET 4 1. a). Write electron configuration for each of the following ions. b). Use Hund’s rule to identify the number of unpaired electrons in degenerate orbitals (i.e., orbitals with the same energy). Mg 2+ Cl - Te 2+ Ni 2+ Cr 3+ Tl + Sb 3+ N 3- Tin (III) Copper (III) 2. The +2 cation of an unknown element, X, has the following as its outermost electron configuration: 4 s 3 d 4 p [Ar] What is element X? 3. Identify which of the elements in each pair has the higher ionization energy and explain why for each. a. Ba or Ca b. Br or Kr c. S or Se d. Si or C 4. Arrange the following group of elements in order of increasing ionization energy: a. Br, Mg, Ca 5. Identify two exceptions to the general trend of ionization energies in going across the period from Li to Ne. Explain why these exceptions occur.
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Dr. Ramesh Arasasingham 6. Consider the following data pertaining to the hypothetical elements Xa, Yb, and Zc and provide the best answer to each of the following questions.
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