In the sixth period, the orbitals that are filled are :
$6 s, 4 f, 5 d, 6 p$
$6 s, 5 d, 5 f, 6 p$
$6 s, 5 f, 6 d, 6 p$
$6 s, 6 p, 6 d, 6 f$
Correct Option: 1
Thus, order of orbitals filled are
$6 s<4 f<5 d<6 p$
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