Question

part b

p³-

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

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Explanation:

Step1: Determine the atomic number of phosphorus

The atomic number of phosphorus ($P$) is $15$. So, a neutral $P$ atom has $15$ electrons.

Step2: Calculate the number of electrons in $P^{3 - }$

Since $P^{3 - }$ has a charge of $- 3$, it has $15 + 3=18$ electrons.

Step3: Write the electron configuration

The electron configuration of an atom/ion with $18$ electrons is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$.

Answer:

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