# What is the electron configuration of platinum? [closed]

Some textbooks write the electron configuration for platinum (Pt) as $$\ce{[Xe] 4f^14 5d^9 6s^1}$$. However, some also write it as $$\ce{[Xe] 4f^14 5d^8 6s^2}$$. Which is correct?

I hope someone can help me with an authoritative source.

The NIST Atomic Spectra Database,[1] which is as authoritative as it gets, shows that $$\ce{5d^9 6s^1}$$ is the correct ground-state electronic configuration for platinum.