The elements that react similarly to Lithium are sodium and potassium.
The valence electron is given as the number of electrons present in the last orbital of the atom. The number of valence electrons in an atom determines its reactivity.
The elements with the same number of valence electrons react similarly. The number of valence electrons in Lithium is 1. Thus, the elements with the presence of 1 valence electron, such as Sodium and Potassium, react similarly to lithium.
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