Which of the following is the ground-state electron configuration for zinc (Zn, atomic number 30)?

• A. $\left[\mathrm{Ar}\right]4^{s}23^{d}8$
• B. $\left[\mathrm{Ar}\right]4^{s}23^{d}10$
• C. $\left[\mathrm{Ne}\right]3^{s}23^{p}64^{s}23^{d}12$
• D. $\left[\mathrm{Ar}\right]4^{s}13^{d}104^{p}1$

Answer: (B)