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प्रश्न
Write down the formulae for the following compounds :
Calcium oxide
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उत्तर
Calcium oxide: CaO
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Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.
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