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A central atom is surrounded by four iodine atoms and an unknown number of unshared (non-bonded) electrons. Which of the following combinations is possible for the electronic arrangement and molecular shape? 1. octahedral / octahedral 2. trigonal bipyramidal / square pyramidal 3. octahedral / square pyramidal 4. tetrahedral / angular 5. tetrahedral / square pyramidal 6. trigonal bipyramidal / seesaw 7. trigonalbipyramidal / T-shaped 8. trigonal bipyramidal / trigonal bipyramidal