Why does the third shell have 8 electrons?
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we know, number of period shows principal quantum number of valance electrons. For above exaplantion , if n = 3 then, 3s , 3p, 3d orbitals . So, in configuration of 3rd period we just take upto 3p⁶ orbitals . ... Thats why third period contain only 8 elements even though the electron capacity of the third shell is 18.
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