Lithium, sodium and potassium are all Group 1 elements. Determine which is the most reactive. LithiumSodiumPotassiumQuestion 10SavedExplain why you selected this element as the most reactive of the three. Try to use the terms trend, atomic radius and valence electron in your answer.

Potassium is the most reactive of the three elements: lithium, sodium, and potassium.

Here's why:

1. Trend: As we move down Group 1 of the periodic table (from lithium to potassium), reactivity increases. This is because the elements at the bottom of the group are more reactive than those at the top.

2. Atomic Radius: The atomic radius of an atom increases as we move down a group in the periodic table. This is due to the addition of energy levels. Potassium has a larger atomic radius than both lithium and sodium, making it easier for the outermost electron to be lost and hence, making potassium more reactive.

3. Valence Electron: All Group 1 elements have one valence electron in their outermost energy level. The ease with which this electron is lost (to form a positive ion) determines the reactivity of the element. As the atomic radius increases, the outermost electron is less attracted to the nucleus and can be lost more easily.