The periods that would contain elements with electrons in s, p, d, and f orbitals are periods 6-7
I learnt k,l,m
so 1-3periods have klm and after that klmn
option D. periods 6-7.
1) Period 1 has two elements. Those are the elements with 1 and 2 electrons. They, then, fill the two 1s orbitals.
⇒ Only s orbitals.
2) Periods 2 and 3, contain 8 elements each.
The 8 elements on the period 2 fill the two 2s and the six 2p orbitals.
The 8 elements on the period 3 fill the two 3s and the six 3p ortitals.
⇒ Only s and p orbitals.
3) The periods 4 and 5 contains 18 elements each.
The 18 elements of period 4 fill the two 4s orbitals, the ten 3d orbitals, and the six 4p orbitals.
The 18 elements of period 5 fill the two 5s orbitals, the ten 4d orbitals, and the six 5p orbitals.
⇒ Only s, p, and d orbitals.
4) The periods 6 and 7 have 32 elements each.
The 32 elements in period 6 fill the two 6s orbitals, the ten 5d orbitals, the fourteen 4f orbitals, and the six 6p orbitals.
The 32 elements in the period 7 fill the two 7s orbitals, the ten 6d orbitals, the fourteen 5f orbitals, and the six 7p orbitals.
So, the only elements that contain electrons in s, p, d, and f orbitals are those of period 6 and 7.