The order in which electrons fill orbitals is as follows:

A. Electrons fill orbitals in order of increasing orbital energy. This is known as the Aufbau principle. It starts from the lowest energy level and moves up to the higher energy levels.

B. The statement that p orbitals fill before the s orbitals in an energy level is incorrect. The s orbitals always fill before the p orbitals. For example, in the second energy level, the 2s orbital fills before the 2p orbitals.

C. Before pairing, 1 electron occupies each s and p orbital. This is known as Hund's rule. It states that every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied.

D. The statement that orbitals s, p, and then d fill in one energy level before starting the next level is incorrect. The correct order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. This is known as the Madelung rule or the diagonal rule.

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The order in which electrons fill orbitals is as follows:

A. Electrons fill orbitals in order of increasing orbital energy. This is known as the Aufbau principle. It starts from the lowest energy level and moves up to the higher energy levels.

B. The statement that p orbitals fill before the s orbitals in an energy level is incorrect. The s orbitals always fill before the p orbitals. For example, in the second energy level, the 2s orbital fills before the 2p orbitals.

C. Before pairing, 1 electron occupies each s and p orbital. This is known as Hund's rule. It states that every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied.

D. The statement that orbitals s, p, and then d fill in one energy level before starting the next level is incorrect. The correct order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. This is known as the Madelung rule or the diagonal rule.

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The order in which electrons fill orbitals is as follows:

A. Electrons fill orbitals in order of increasing orbital energy. This is known as the Aufbau principle. It starts from the lowest energy level and moves up to the higher energy levels.

B. The statement that p orbitals fill before the s orbitals in an energy level is incorrect. The s orbitals always fill before the p orbitals. For example, in the second energy level, the 2s orbital fills before the 2p orbitals.

C. Before pairing, 1 electron occupies each s and p orbital. This is known as Hund's rule. It states that every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied.

D. The statement that orbitals s, p, and then d fill in one energy level before starting the next level is incorrect. The correct order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. This is known as the Madelung rule or the diagonal rule.

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