This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Kekule biatomic radical chain. Kekul's symbol for chain of five biatomic radicals divalent atom or functional group Own Physchim Kekul symbols Images tierces pour le Grand dictionnaire universel du XIXe sicle
Page 2023 Free-images.com. All images are Public Domain