Of the various elements in chemistry, does any one have different isotopes or all the same?

Answer 1

http://chemlab.pc.maricopa.edu/periodic/periodic.html

THIS ONLINE PERIODIC TABLE WILL GIVE YOU EVERY KNOWN ISOTOPE OF EACH ELIMENT ASWELL AS DECAY RATES AND PROPERTY

Answer 2

I am not sure of the question but if it is what I can surmise... then
the ordinary isotope of hydrogen, H, is known as Protium, the other two isotopes are Deuterium (a proton and a neutron) and Tritium (a proton and two neutrons). Deuterium and Tritium are both used as fuel in nuclear fusion reactors. One atom of Deuterium is found in about 6000 ordinary hydrogen atoms