chemistry help!?

Question

what is the common isotopes of He, Ne, Kr?

Answer 1

Isotopes of Helium (Z=2)

http://ie.lbl.gov/education/parent/He_iso.htm

Isotopes of Neon (Z=10)

http://ie.lbl.gov/education/parent/Ne_iso.htm

Isotopes of Krypton (Z=36)

http://ie.lbl.gov/education/parent/Kr_iso.htm


Hope these links helped

Answer 2

Very interesting.