# How can you find the electron configuration of Zn?

By taking the atomic number of $Z n$, and use of the old $\text{aufbau principle.}$
For $Z n$ we got $Z = 30$....and thus....
$1 {s}^{2} 2 {s}^{2} 2 {s}^{6} 3 {s}^{2} 3 {s}^{6} 3 {d}^{10} 4 {s}^{2}$