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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
Write the distribution of electrons in an atom of element whose atomic number is $18.$ What is special about the outermost electron shell (or valence shell) of the atom of this element?
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Answer

Atomic No: $18$
Electronic configuration: $(2, 8, 8)$
The special thing about the outermost shell is that it is completely filled with the electrons.

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