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  4. Two elements, X and Y, have atomic numbers 33 and 17, respectively. The molecular formula of a stable compound formed between them is

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Q. Two elements, $X$ and $Y$, have atomic numbers $33$ and $17$, respectively. The molecular formula of a stable compound formed between them is

KVPYKVPY 2014

Solution:

$X$ with atomic number $33$ and $Y$ with atomic number $17$ belong to $15th$ and $17th$ group respectively.
Thus, the valency of $X$ and $Y$ are $3$ and $1$ respectively.
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$\therefore $ The molecular formula of a stable compound formed between $X$ and $Y$ is $XY_3$.
Here, $X$ could be $As (Z = 33)$ and $Y$ could be $Cl(Z =17)$ which gives compound $AsCl_3$ .