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Structure of the Atom — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
The electron distribution in an aluminium atom:
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Answer

Aluminium atom has $13$ protons and $13$ electrons.
$\text{K L M}$
Therefore, Electronic configuration of $_{13}AI = 2, 8, 3$

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