Question

p3-
express your answer in complete form, in order of increasing orbital. for example, 1s²2s² would be entered as 1s^22s^2.

Explanation:

Step1: Determine the atomic number of P

The atomic number of phosphorus (P) is 15.

Step2: Consider the charge of \(P^{3 -}\)

Since it has a charge of \(3-\), it gains 3 electrons. So total electrons = \(15 + 3=18\)

Step3: Write the electron - configuration

Using the Aufbau principle, electrons fill orbitals in the order \(1s<2s<2p<3s<3p\).
For 18 electrons:

• \(1s\) orbital can hold 2 electrons: \(1s^{2}\)
• \(2s\) orbital can hold 2 electrons: \(2s^{2}\)
• \(2p\) orbital can hold 6 electrons: \(2p^{6}\)
• \(3s\) orbital can hold 2 electrons: \(3s^{2}\)
• \(3p\) orbital can hold 6 electrons: \(3p^{6}\)

Answer:

\(1s^{\wedge}22s^{\wedge}22p^{\wedge}63s^{\wedge}23p^{\wedge}6\)