What is the electron configuration using core notation for P3-?

Question

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The electron configuration for P3- is [Ar]. P3- means that the phosphorus atom has gained three additional electrons compared to its neutral state. The neutral phosphorus atom has an electron configuration of [Ne] 3s² 3p³. When it gains three electrons, these extra electrons fill up the 3p orbital, resulting in a configuration of [Ne] 3s² 3p⁶, which is equivalent to the electron configuration of argon (Ar), a noble gas.

What Is the Electron Configuration Using Core Notation for P3-