Which describes an isotope? A. two atoms of two different elements that have the same atomic mass B. two atoms of the same element that differ because they have a different number of neutrons C. two atoms of two different elements that have the same number of neutrons D. two atoms of the same element that differ because they have a different number of protons

Question

Which describes an isotope?  A.  two atoms of two different elements that have the same atomic mass  B.  two atoms of the same element that differ because they have a different number of neutrons  C.  two atoms of two different elements that have the same number of neutrons  D.  two atoms of the same element that differ because they have a different number of protons

danjs · Answer

This should be in the chemistry section, but here ya go... read the first sentence here http://en.wikipedia.org/wiki/Isotope

wolf1728 · Answer

isotopes - 2 atoms same # of protons different # of neutrons