ANSWERS: 1
  • A few things P = phosphorus K = potassium I do not believe potassium pentabromide can exist. A salt of a compound like phosphorus pentabromide and potassium bromide, end with a ide, not a ine. In PBr5 the three electrons of the 2p block are shared and the two electrons of the 3s block are shared. If you notice, when you fill in the 3 electrons of the 2p block, there are no free electrons. This means the Phosphorus tribromide is also probably a stable compound. Get a photocopy of a periodic table (with full names of elements). The one in the back of you book is not good beause who wants to be flipping to the bak of the book constantly. These problems are much easier to solve if you are looking at a periodic table and can count to the end of a row to see how to fill out the orbitals. (and how not to mistake the names of elements. ;P

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