1. Tardigrade
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  3. Chemistry
  4. Ionization energy in group IA varies in the decreasing order as

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Q. Ionization energy in group IA varies in the decreasing order as

Classification of Elements and Periodicity in Properties

Solution:

Due to the large size of group IA elements, the outermost. electron is far from the nucleus and can be easily removed. Their ionization energies or ionization potentials are relatively low.

$\begin{matrix}&Li&Na&K&Rb&Cs\\ {\text{Ionization potential (eV)}}&5.4&5.1&4.3&4.2&3.9\end{matrix}$