Which of the following s-block elements is the least reactive?

Which of the following s-block elements is the least reactive?

Correct Answer: Lithium

Step 1: Understand what s-block elements are. They are found in the first two groups of the periodic table, which include alkali metals and alkaline earth metals.
Step 2: Identify the alkali metals in the s-block. These are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Step 3: Know that reactivity increases as you move down the group in the periodic table for alkali metals.
Step 4: Compare the reactivity of lithium with other alkali metals. Lithium is at the top of the group, while the others are lower down.
Step 5: Conclude that since lithium is the highest in the group, it is the least reactive compared to the other alkali metals.

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