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JEEMAIN and NEET
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Chemistry
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Classification of Elements and Periodicity in Properties
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Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: K, Ca, Rb
$\begin{array}{1 1} Ca > K > Rb \\ K > Rb > Ca \\ Ca > Rb > K \\ Rb > Ca > K \end{array} $
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