Physics

I’ll give brainiest! :)

isotopes are the same element, but have different numbers of neutrons (but still have the same number of electrons and protons), hence have a different mass number.

Isotope is each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.

It means it has same atomic number but different mass number.

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.