Write down the formula of :(i) Sodium oxide (ii) Aluminium chloride (iii) Sodium sulphide
Question
Write down the formula of:
(i) Sodium oxide
(ii) Aluminium chloride
(iii) Sodium sulphide
Solution
(i) The formula for Sodium oxide is Na2O. This is because Sodium (Na) has a valency of +1 and Oxygen (O) has a valency of -2. To balance these charges, we need 2 Sodium atoms for every Oxygen atom.
(ii) The formula for Aluminium chloride is AlCl3. This is because Aluminium (Al) has a valency of +3 and Chlorine (Cl) has a valency of -1. To balance these charges, we need 3 Chlorine atoms for every Aluminium atom.
(iii) The formula for Sodium sulphide is Na2S. This is because Sodium (Na) has a valency of +1 and Sulphur (S) has a valency of -2. To balance these charges, we need 2 Sodium atoms for every Sulphur atom.
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