Group 1 Elements: alkali metals, react with water to produce an hydroxide and hydrogen, reactivity increases as you go down the group, form +1 ions, soft metals, e.g. potassium, 1 electron in the outer shell, Group 7 Elements: halogens, diatomic - come in pairs of atoms, reactivity decreases as you go down the group, form -1 ions, coloured gases, liquids and solids, e.g. chlorine, 7 electrons in the outer shell, Group 0 Elements: noble gases, inert (unreactive), colourless gases, monatomic - exist as single atoms, e.g. helium, full outer shell of electrons,

Groups of the Periodic Table

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