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(A) The atomic number of Magnesium $(Mg)$ is $12$.According to the Bohr-Bury scheme,the maximum number of electrons that can be accommodated in a shel

Vedclass · Accepted Answer

$2, 8, 2$

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(A) The atomic number of Magnesium $(Mg)$ is $12$.According to the Bohr-Bury scheme,the maximum number of electrons that can be accommodated in a shell is given by the formula $2n^2$,where $n$ is the orbit number.The first shell ($K$-shell,$n=1$) can hold a maximum of $2(1)^2 = 2$ electrons.The second shell ($L$-shell,$n=2$) can hold a maximum of $2(2)^2 = 8$ electrons.The remaining electrons go into the third shell ($M$-shell,$n=3$).For $Mg$ $(Z=12)$,the distribution is $2$ in the $K$-shell,$8$ in the $L$-shell,and $2$ in the $M$-shell.Thus,the electronic configuration is $2, 8, 2$.

Element	Protons,Neutrons,Electrons
$A$	$9, 10, 9$
$B$	$16, 16, 16$
$C$	$12, 12, 12$
$D$	$17, 22, 17$

Which of the following correctly represents the electronic distribution in the $Mg$ atom?

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