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Structure of the Atom — Science STD 9 — Question

Maharashtra 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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