Question

symbol of hydrogen, calcium, oxygen and their valency

Answer 1

hydrogen(H)=1
calcium(ca)=2
oxygen(O)=2

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Answer 2

Symbol for Hydrogen is $\texbf{H}$
It's valency is 1

Symbol for Calcium is $\texbf{Ca}$
It's valency is 2
The valency of an

Symbol for Oxygen is $\texbf{O}$
It's valency is 2

The valency of an element is determined by the number of outer shell valence electrons

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