Question

20 sep use models list the subshells that hold the 25 electrons in a manganese atom in order of increasing energy.

Explanation:

Step1: Recall electron - filling rules

Electrons fill subshells in order of increasing energy according to the Aufbau principle, Pauli - exclusion principle, and Hund's rule. The order of subshells by increasing energy is 1s < 2s < 2p < 3s < 3p < 4s < 3d etc.

Step2: Fill electrons for manganese (Z = 25)

1s can hold 2 electrons, 2s can hold 2 electrons, 2p can hold 6 electrons, 3s can hold 2 electrons, 3p can hold 6 electrons, 4s can hold 2 electrons, and 3d can hold 7 electrons to reach a total of 25 electrons.

Answer:

1s, 2s, 2p, 3s, 3p, 4s, 3d