According to Wikipedia
Isotope of nickel has the highest binding energy per nucleon. But according to a statement in the standard textbook of our country it is said that Fe has the highest binding energy per nucleon.
Now I'm confused if I should believe at what is written on the internet or at the textbook that is being used by all high schools in our country. I hope this is not out of topic. Please let me know which element actually has more binding energy per nucleon with a reliable source.