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⇒ very reactive metals and can explode if they are exposed to water
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Alkali metals: 1 st column = lithium, sodium, potassium, (rubidium, caesium and francium).Several groups of representative elements are known by common names: The top-row elements are called lanthanides and the bottom-row elements are actinides The inner transition metals: elements in the 2 rows at the bottom of the table.The transition metals: elements in the groups between the elements of the main group (groups 3-12).The main-group elements: elements in the 2 groups on the far left and the 6 groups on the far right of the periodic table (groups 1, 2, 13-18).
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Members of the same group have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. Here He Lies Beneath Bed Clothes, Nothing On, Feeling Nervous, Naughty Mar gret Always Sighs, " Please Stop Clowning Around "Ī vertical column of elements is called a group.