Determine the chemical formula of potassium oxide. Show your working by identifying the metal ion and non-metal ion, and then the chemical formula.
Question
Determine the chemical formula of potassium oxide. Show your working by identifying the metal ion and non-metal ion, and then the chemical formula.
Solution
Step 1: Identify the metal ion and non-metal ion
The metal ion in this case is Potassium (K). In a reaction, Potassium loses one electron to achieve a stable electron configuration, and thus forms a +1 ion: K+.
The non-metal ion is Oxygen (O). Oxygen needs to gain two electrons to achieve a stable electron configuration, and thus forms a -2 ion: O2-.
Step 2: Determine the chemical formula
To form a neutral compound, the total charges from the metal ions and non-metal ions must balance out. In this case, we need two Potassium ions to balance out the charge of one Oxygen ion.
Therefore, the chemical formula of potassium oxide is K2O.
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