Question

The electron distribution in an aluminium atom is?

• A. $2,3,8$
• B. $2,8,2$
• C. $2,8,3$
• D. $8,2,3$

Answer 1

The correct option is C

$2,8,3$

The explanation for the correct answer :

Option(C):$2,8,3$

• The number of electrons for the aluminium atom is $13$ electrons, for which the electron configuration of aluminium can be given as:

$\mathrm{Al}(\mathrm{Z}=13)=1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^1$

• Here the first two electrons are present in the $1\mathrm{s}$ orbital, which can accommodate two electrons.
• The further two electrons of aluminium will go in the $2\mathrm{s}$ orbital.
• The next six electrons tend to go in the $2\mathrm{p}$ orbital, which can hold up to six electrons.
• further, we can put the next two electrons in the $3\mathrm{s}$. and the rest of one electron will go into the $3\mathrm{p}$ orbital.
• Therefore, the electron distribution in the aluminium atom is given as:$2,8,3$.

Hence, the electron distribution in an aluminium atom is given as:$2,8,3$, option (C) is the correct answer.