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Periodic Classifications of Elements
(a)- What property do all elements in the same column of the Periodic Table as boron have in common?
(b)- What property do all elements in the same column of the Periodic Table as fluorine have in common?
(a)- The atomic number of boron is 5. Its electronic configuration is (2, 3). This means that the boron has three valance electrons and its valency is +3. So, the elements belong to the same group as boron will have 3 valence electrons. For example, the electronic configuration of aluminium is (2, 8, 3), so it has three valance electrons and it belongs to the same group as boron.
(b)- The atomic number of fluorine is 9. Its electronic configuration is (2, 7). This means that the fluorine has seven valance electrons and its valency is -1. So, the elements belong to the same group as fluorine will have 7 valence electrons. For example, the electronic configuration of chlorine is (2, 8, 7), so it has seven valance electrons and it belongs to the same group as fluorine.
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