Question: how many valence electrons are in au?
Answer: Gold (Au) atomic number 79 has an electronic structure 2, 8, 18, 32, 1. So straight away from this fact, you would say it has 1 valence electron, its outer single electron. And indeed, it forms many univalent compounds such as the gold halides (AuF, AuCl, AuBr). Interesting question ….