What is the trend as we go down group 1?

As we move down Group 1 of the Periodic Table, which includes alkali metals like lithium, sodium, and potassium, the reactivity of the elements increases. This trend is due to the decreasing ionization energy, making it easier for these metals to lose their outermost electron. Additionally, the atomic radius increases, leading to weaker attraction between the nucleus and the outer electron. Consequently, these elements react more vigorously with water and other substances as we go down the group.