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are all of the group 1 metals solid at roomtemperature
Elements of group 1 are called alkali metals. Each atom contribute one electron each toward metallic bonds between themselves and forms a large network of positive ions, called kernel, embedded in a 'sea' of electrons. Due to strong electrostatic force of attraction between the kernel and the 'sea' of electrons, large amount of energy is required to separate metal atoms, hence they are solids at room temperature.
They are, however, softest of the metallic solids because of involvement of only one electron (per atom) in metallic bond formation. In fact lithium metal is the least dense of all metals.
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