The valency of oxygen is 2. Find the formula of the oxide of (a) sodium, (b) magnesium, (c)…
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The valency of oxygen is . Find the formula of the oxide of (a) sodium, (b) magnesium, (c) aluminium and (d) silicon. First find the valency of each from its electron arrangement.
Need a reminder? The key ideaShow
Metal oxides are basic, non-metal oxides are acidic, and aluminium oxide is amphoteric. Across period 3 the oxides turn from basic to acidic. The formula follows the valency: oxygen has a valency of .
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Sodium, valency : .
Step 2. (b) Magnesium, valency : , which simplifies to MgO.
Step 3. (c) Aluminium, valency : .
Step 4. (d) Silicon, valency : , which simplifies to .
Answer: , MgO, and .
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