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Less reactive than Group I elements. The reasoning for this is because it is more difficult to lose two electrons compared to losing just one electron. They mostly React with water to form alkaline solutions. ...Now This is because the smaller an atom the closer the outer electrons are to the nucleus.
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The reasoning for this is that it is more difficult to lose two electrons compared to losing just one electron.

Why is group 1 the most reactive?

Group 1 of the periodic table includes hydrogen and alkali metals. Because they have just one valence electron, group 1 elements are very reactive.

Why are the elements in groups 1 and 2 highly reactive?

Alkali metals are among the most reactive metals in the periodic table and this is due to their larger atomic radii and low ionization energies. They tend to donate their electrons in reactions and have an oxidation state of +1. 4.

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