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Question
11. Write the chemical formulae for each of the following compounds:
(d) Calcium oxide
11. Write the chemical formulae for each of the following compounds:
(d) Calcium oxide
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Solution
Chemical formula can be written by using criss-cross method.
In the criss-cross method, the numerical value of the ion charge of the two atoms are crossed over, which becomes the subscript of the other ion.
- For example, Calcium has an atomic number of 20 and a valency of 2.
- It signifies the outermost shell has two electrons for bonding.
- Oxide (oxygen) has an atomic number of 8 and possesses 6 electrons in its outermost shell.
- It only need two more atom for bonding.
- As a result, we'll use calcium atoms to bond with one atom of oxygen.
Hence, by using criss-cross method, the formula of the Calcium oxide is CaO
Chemical formula can be written by using criss-cross method.
In the criss-cross method, the numerical value of the ion charge of the two atoms are crossed over, which becomes the subscript of the other ion.
- For example, Calcium has an atomic number of 20 and a valency of 2.
- It signifies the outermost shell has two electrons for bonding.
- Oxide (oxygen) has an atomic number of 8 and possesses 6 electrons in its outermost shell.
- It only need two more atom for bonding.
- As a result, we'll use calcium atoms to bond with one atom of oxygen.
Hence, by using criss-cross method, the formula of the Calcium oxide is CaO
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