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| Electronic Nature of Metals |
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| Metals are the elements which form positive ions by losing electrons, while non-metals always gain electrons. All metals (except hydrogen) form positive ions by loosing electrons. Metals have 1 to 3 electrons in the outermost shell of their atom and non-metals have 4 to 8 electrons in the outermost shell. Atomic number of aluminium is 13, so the electronic configuration of Al is 2, 8, and 3. Aluminium has 3 electrons in the valence shell. |
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| There are two exceptions to this rule: Hydrogen and helium. Hydrogen is non-metal having 1 electron in the valence shell and helium too is a non-metal having 2 electrons in the valence shell. |
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