Two elements X and Y have following electronic configurations X: 1s2 2s2 2p6 3s2 3p6 4s2 Y: 1s2 2s2 2p6 3s2 3p5 The expected compound formed by combination of X and Y will be expressed as

Question

Two elements X and Y have following electronic configurations X: 1s2 2s2 2p6 3s2 3p6 4s2 Y: 1s2 2s2 2p6 3s2 3p5 The expected compound formed by combination of X and Y will be expressed as (A) XY2 (B) X5Y2 (C) X2Y5 (D) XY5

Tardigrade Admin · Accepted Answer

Valency of element X is 2 (electrons in the outermost shell) while that of element Y is 1 (electron required in the outermost shell to complete octet). So, the formula of the compound between X and Y is XY2 <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/fd449778ded0f03a416b2683db785ba1-.png" />

Q. Two elements $X$ and $Y$ have following electronic configurations
$X : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2}$
$Y : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}$
The expected compound formed by combination of $X$ and $Y$ will be expressed as

$X Y_{2}$

$X_{5} Y_{2}$

$X_{2} Y_{5}$

$X Y_{5}$

Valency of element $X$ is $2$ (electrons in the outermost shell) while that of element $Y$ is $1$ (electron required in the outermost shell to complete octet). So, the formula of the compound between $X$ and $Y$ is $X Y_{2}$

Q. Two elements X and Y have following electronic configurations X:1s22s22p63s23p64s2 Y:1s22s22p63s23p5 The expected compound formed by combination of X and Y will be expressed as

XY2​

X5​Y2​

X2​Y5​

XY5​