Discuss the difference among the atomic radii of na and k, Chemistry

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Discuss the difference among the atomic radii of na and k

a.The difference among the atomic radii of NA and K is relatively large compared to the difference between the atomic radii of Rb and Cs. Why?

b.A sample of nickel chloride is attracted into a magnetic field whereas a sample of zinc chloride is not. Why?

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Chemistry: Discuss the difference among the atomic radii of na and k

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