The chemistry question to calculate how many valence electrons does bismuth have we need to understand bismuth element.
Bismuth is a chemical element that is related to antimony and polonium. It is a silvery-white metal that occurs naturally as bismuthinite (Bi4SbO6) and bismuthinite-(Ce). Its atomic number is 83; its atomic mass is 207.904.
Bismuth has a valence electron count of +5.
so when you are asked
How many valence electrons does bismuth have?
short answer is +5