![]() ![]() They have relatively low melting points compared to metals in general.They are relatively low density metals.Alkali metals and alkaline earth metals have the following properties:.Because of their reactivity, they were not isolated as metals until later on. Their oxides all produce alkaline solutions in water, which is how they get their names. They have been known for quite a long time through their compounds, like their metal oxides, because they are reactive and quickly form compounds with oxygen in air. The alkali metals in group 1 and the alkaline earth metals in group 2 are very well-studied groups of elements, with clear patterns in how their properties change. ![]() Their behaviour in chemical reactions is similar because of the similar outer shell configuration. Groups 1 and 2 have 1 and 2 electrons in the outer shell, respectively. Therefore, it is easy to see which elements have similar properties to each other – they will be in the same column of the table as each other, the columns which we call groups. The number of outer shell electrons dictates the chemical properties of an element. We saw earlier that the Periodic Table is arranged, left to right, by proton number and number of outer shell electrons.To know the common reactions of group 1 and group 2 elements.To apply knowledge of electronic structure and bonding to explain the trends in group 1 properties.To understand the trend in properties found in the alkali metals.To recall properties of the alkali metals. ![]()
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