# 12. (a) (20 pts) Thiosulfate, S20}", is just like sulfate, except that one oxygen atom in...

###### Question:

12. (a) (20 pts) Thiosulfate, S20}", is just like sulfate, except that one oxygen atom in sulfate has been substituted by sulfur. Draw one correct Lewis structure for thiosulfate, showing all lone pairs and all formal charges, if different than zero. (b) (10 pts) Keeping in mind our stated ideas about how to optimize Lewis structures for atoms like P, S, As etc. that do not have to follow the octet rule, how many total resonance structures are there for thiosulfate? n = Lucky 13. Refer to the following molecular formulas by their letter designations A-H when answering. If none of the letters designating a structure match the criteria, write “none”. Each answer could be one or more letters (or “none”). “Orbital geometry" refers to central atom in AX, type. NaCl KF SF6 XeF4 SOZ SO3 BF3 NO A B C D E F G H (a) (5 pts) Which one(s) have a high melting point? (6) (5 pts) Which one(s) have octahedral orbital geometry? (d) (5 pts) Which one(s) have no dipole moment? (e) (5 pts) Which one(s) are a free radical?

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