* Alkali Metals: Alkali metals are in Group 1 of the periodic table (Li, Na, K, Rb, Cs, Fr).

* Reactivity: Alkali metals become *more* reactive as you move down the group. This is because their outermost electron is further from the nucleus and more easily lost, leading to stronger reactivity.

* Calcium: Calcium is an alkaline earth metal (Group 2), and it's less reactive than the alkali metals.

Therefore, no alkali metal element is less reactive than calcium.