Question

overlapping orbitals the individual atomic orbitals in an atom overlap in three - dimensional space. nucleus orbitals in a magnesium atom a magnesium atom has 12 electrons that are found in the 1s, 2s, 2p, and 3s subshells. the 1s orbital is the closest to the nucleus, while the 3s orbital is the farthest away. relative energies of subshells in a given shell, the orbitals in each subshell have the same energy. for example, the three p orbitals all have the same energy. within a given shell, the order of subshells from lowest to highest energy is s < p < d < f. however, the subshells within a shell can overlap with the subshells of another shell. subshell energies subshells have different energies because the electrons in an atom repel each other. electrons populate the lowest possible energy subshells first. the zigzag line shows how energy increases from one subshell to the next. within a subshell, the orbitals have the same energy. all three 2p orbitals have the same energy. they have more energy than the 2s orbital, but they have less energy than the 3s orbital. 24 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 order

Electrons fill subshells in order of increasing energy following the Aufbau principle. The order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

Step2: Fill electrons for manganese

Manganese has 25 electrons.

• 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.
• After filling 1s²2s²2p⁶3s²3p⁶4s², we have used 2 + 2+6 + 2+6 + 2=20 electrons.
• The remaining 5 electrons go into the 3d sub - shell.

Answer:

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