Even though the charge of the nucleus increases the outer electron is shielded from most of the positive charge of the nucleus by electrons in the inner shells.This makes it easier for an atom to lose it's outer electron. The outer electron is further away from the nucleus with each additional electron shell making the force of attraction weaker.The reactivity increases as you go down the group because: In a chemical reaction the electron in the outer shell is lost. Alkali Metals all produce strong alkalis. Alkali Metals all react strongly with water to produce metal hydroxides and Hydrogen gas. The Alkali Metals in order from least reactive to most reactive are:Ĭhemical Properties Alkali Metals are all highly reactive and will oxidise quickly in the presence of Oxygen. ![]() ![]() Alkali Metals all produce ions with a +1 relative charge because they lose an electron in chemical reactions. ![]() The Alkali Metals have similar chemical properties because they all have one electron on their outer shell. NB: Hydrogen is often shown in Group 1 due to having a single electron in the outer shell however it is not considered an Alkali Metal because it has very few properties in common with Alkali Metals.Ībout the Alkali Metals Though Hydrogen has one electron in the outer shell it does not behave the same as other elements in group 1 so it is not considered to be an Alkali Metal. Group 1 elements are shown in light purple at the far left of the Periodic Table.
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