@misc{ enwiki:1208766738, author = "{Wikipedia contributors}", title = "Hund's rule of maximum multiplicity --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", url = "https://en.wikipedia.org/w/index.php?title=Hund%27s_rule_of_maximum_multiplicity&oldid=1208766738", note = "[Online; accessed 9-July-2024]" }
url
(\usepackage{url}
somewhere in the preamble), which tends to give much more nicely formatted web addresses, the following may be preferred:
@misc{ enwiki:1208766738, author = "{Wikipedia contributors}", title = "Hund's rule of maximum multiplicity --- {Wikipedia}{,} The Free Encyclopedia", year = "2024", howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Hund%27s_rule_of_maximum_multiplicity&oldid=1208766738}", note = "[Online; accessed 9-July-2024]" }