Why does the reactivity of the alkali metals decrease from cesium to lithium?

Chemistry by OpenStax (2015-05-04)
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ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter18: Representative Metals, Metalloids, And Nonmetals
Section: Chapter Questions
Problem 2E: Why does the reactivity of the alkali metals decrease from cesium to lithium?
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Why does the reactivity of the alkali metals decrease from cesium to lithium?

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The alkali earth metal include: Li, Na, K, Rb and Cs. They have a valence electron configuration which can be generally represented as ns1, where 'n' is the principle quantum number. 

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