# What is the number of valence electrons in hydrogen?

...why? For hydrogen, $Z = 1$; there is ONE positively-charged, nuclear particle. For neutrality, there must be ONE negatively-charged EXTRANUCLEAR particle, and we call these beasts electrons.
Undr standard conditions, the electrons overlap to for form an $H - H$ bond, to give the dihydrogen molecule, ${H}_{2}$...