# What element has the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^3?

If there are $15$ $\text{electrons}$ in the neutral atom.....
There must be also $15$ $\text{protons}$ in the element's nucleus. And thus if $Z = 15$, the element must be $\text{phosphorus}$.
What about the configuration: $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{5}$?