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(A) Step $1$: Identify the elements.$(i)$ The element with atomic number $19$ is Potassium $(K)$,which belongs to Group $1$. It has a valency of $+1$.

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$(i) KI, (ii) H_2O$

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(A) Step $1$: Identify the elements.$(i)$ The element with atomic number $19$ is Potassium $(K)$,which belongs to Group $1$. It has a valency of $+1$. Iodine $(I)$ belongs to Group $17$ (Halogens) and has a valency of $-1$. The compound formed is $KI$.Step $2$: Identify the elements.$(ii)$ The first element is Hydrogen $(H)$,which has a valency of $+1$. Oxygen $(O)$ belongs to Group $16$ and has a valency of $-2$. The compound formed is $H_2O$.

What will be the formula of the compound formed between the following elements?
$(i)$ The element with atomic number $19$ and iodine.
$(ii)$ The first element and oxygen.

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What will be the formula of the compound formed between the following elements?$(i)$ The element with atomic number $19$ and iodine.$(ii)$ The first element and oxygen.