The high reactivity in the first column of the periodic table can be attributed to the fact that the elements in this column all have a single valence electron in their outermost shell.
This single electron is more loosely held than the inner electrons, making it more readily available for reactions. Additionally, the elements in the first column of the periodic table are all highly electronegative, meaning they are more likely to gain an electron than to lose one.
This helps to form strong bonds with other elements, making them highly reactive. The elements in the first column of the periodic table also have the smallest atomic radii, which further increases their reactivity. All of these factors combined lead to the high reactivity of the elements in the first column of the period table.
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