High School

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We fill orbitals in order of increasing energy, not by the principal quantum number (n). Therefore, we fill in this order:

a) 1s, 2s, 2p, 3s, 3p, 4s, 3d, ...

b) 1s, 2s, 2p, 3s, 3p, 3d, 4s, ...

c) 1s, 2s, 2p, 3s, 3p, 4s, 4p, 4d, ...

d) 1s, 2s, 3s, 4s, 5s, ...

Answer :

Final answer:

The correct order for filling orbitals is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, and 7p.

Explanation:

The correct order for filling orbitals is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, and 7p. The order of filling is based on observed experimental results and is confirmed by theoretical calculations. As the principal quantum number, n, increases, the size of the orbital increases and the energy associated with the orbital is higher.

Within each shell, as the value of 1 increases, the electrons are less penetrating and the energy of the orbitals increases in the order s > p > d > f.

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