1s<2s=2p<3s=3p=3d <4s=4p=4d=4f<.... For multi electron atoms, the energy of the orbitals

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A series of orbitals are given below. Identify the sets which represent the correct order of filling up of orbitals.
(A)

3 s, 3 p, 3 d, 4 s, 4 p

(B)

4 s, 4 p, 5 s, 4 d, 5 p, 4 f

(C)

2 s, 2 p, 3 s, 3 p, 4 s, 3 d, 4 p

(D)

1 s, 2 s, 2 p, 3 s, 3 p, 3 d

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in multi-electron atom 4s-orbital is lower in energy than 1)3d-orbital 2)3p-orbital 3)2s-orbital 4)2p-orbital

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For multi electron system, the energies goes like

1s < 2s < 2p < 3s < 4s < 3d . . . . . .

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The electronic configuration is given as:

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6} 4 d^{10} 5 s^{2}

is for:

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Group the following electronic configurations in pairs that would have different chemical properties of their atoms
(a)

{1 s}^{2}, {2 s}^{2}, {2 p}^{5}

(b)

{1 s}^{2}, {2 s}^{1}

(c)

{1 s}^{2}, {2 s}^{2}, {2 p}^{6}

(d)

{1 s}^{2}, {2 s}^{2}, {2 p}^{6}, {3 s}^{2}, {3 p}^{5}

(e)

{1 s}^{2}, {2 s}^{2}, {2 p}^{6}, {3 s}^{2}, {3 p}^{6}, {4 s}^{1}

(f)

{1 s}^{2}, {2 s}^{2}, {2 p}^{6}, {3 s}^{2} {3 p}^{6}, {4 s}^{2}, {3 d}^{10}, {4 p}^{6}

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