Final answer:
The electrons placed in the 3p orbital for phosphorus follow the ordering: 3s > 3p > 3d.
Step-by-step explanation:
The electrons placed in the 3p orbital for phosphorus follow the ordering: 3s > 3p > 3d. This means that the 3s subshell is filled first, followed by the 3p subshell, and then the 3d subshell. The 3s subshell can hold a maximum of 2 electrons, the 3p subshell can hold a maximum of 6 electrons, and the 3d subshell can hold a maximum of 10 electrons.