Calculate the predicted atomic radius for potassium,K,given the atomic radius of rubidium,Rb, (0.247 nm)and cesium,Cs, (0.265 nm).

Question

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The atomic radius generally decreases as you move up a group in the periodic table because the number of electron shells decreases, leading to a smaller atomic size. Potassium (K) is above rubidium (Rb) and cesium (Cs) in Group 1, so its atomic radius should be smaller than both Rb and Cs. Given the trend, the atomic radius of K should be less than 0.247 nm but not drastically smaller, making 0.229 nm a reasonable estimate.

Calculate the Predicted Atomic Radius for Potassium,K,given the Atomic Radius