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Based on their positions in the periodic table, list the following ions in order of increasing radius: ${K}^{+}, {Ca}^{2+}$ ${Al}^{3+}, {Si}^{4+}$
Chemistry 101
Chapter 6
Electronic Structure and Periodic Properties of Elements
Electronic Structure
Periodic Table properties
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problems. 77 from Chapter six is asking us to rink, potassium, calcium, aluminum and silicone in order of increasing Rabia. So to answer this question, it's important to remember that radius increases going down a group but decreases going across a period. So those elements on the left hand side of the periodic table are going to have a greater radius than those on the right. And those elements that are on the top of the periodic table are going to have a lower, smaller radius than those towards the bottom of the periodic table. So let's highlight the, um, elements that we are, um, ranking. So we have potassium, calcium, aluminum and silicone. So as silicone is on the furthest right of the periodic table, no one's gonna have this smallest radius. Next we have, um, aluminum aluminum is just right next to silicone s. Oh, that one's gonna have the next smallest radius. Next choice. We had to choose between potassium and calcium by the same logic we used to distinguish aluminum and silicone radius. We're gonna do the same for Councilman potassium. So calcium is slightly further to the right than potassium. So that's going to be the next smallest or second largest radius of this group, and finally we have potassium as the element with the greatest radius out of thes four.
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