The nucleus of an atom contains six neutrons and esix protons. The nucleus of a second atom contains six neutrons and five protons. Are they atoms of different elements or isotopes of the same element?

Answer 1

Since this is not my area of expertise, I searched Google under the key words "neutron proton elements isotopes" to get these possible sources:

http://home.earthlink.net/~kdthrge/sub3.htm
http://www.mcwdn.org/Physics/Atoms.html
http://web.jjay.cuny.edu/~acarpi/NSC/3-atoms.htm
http://en.wikipedia.org/wiki/Isotope

After reading the information in these sites, you should be able to answer your own question. In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.