Why the third period contains only 8 elements even through the electron capacity of the 3rd shell is 18
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we know 3rd shell can hold 18 elements but the 3d orbital is greater than 4s orbital so elements enter 4s orbital &then into 3d. the orbitals in outermost configuration of 3period orbitals are 3s, 3p. the maximum number of electrons hold by this orbitals =2+6=8.so it has 8elements
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