Chem 1320 1st Edition Lecture 22Outline of Last Lecture I. Formal ChangeII. Transition MetalsOutline of Current Lecture I. Ion SizesII. The Role of Atomic Radii in Ion ChannelsCurrent LectureI. Ion SizesExamples: (l) 0 vs. 02 [He] 2s22p4 [He] 2s22p6In that example the ion size increases Na vs. Na+ [Ne] 3s1 [Ne] In that example the ion size decreasesS2-, Cl-, K+, Ca2+ largest to smallest?S2-> Cl->K+> Ca2+- Cations are smaller than original ions, anions are smallerII. The Role of Atomic Radii in Ion ChannelsThey are prevalent in nerve cells or neurons, necessary for rapid electrical signaling in these cells, and selective for a specific ion, size. Sodium channels are selective for sodium even in presence of potassium. Example: order from smallest to largest (K+, Na+,K)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Na+< K+<
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