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Structure of the Atom — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceStructure of the Atom2 Marks
Question
$Na^+$ has completely filled $K$ and $L$ shells. Explain.
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Answer

$Na$ has atomic number $11,$ so its electronic configuration is $= 2, 8, 1$ When it gives away its outermost shell single electron it changes to $Na^+ = 10 = 2, 8$ The above configuration indicates completely filled $K, L$ shells.

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