one isotope
Curium is an artificial chemical element. Number of neutrons = Atomic mass of an isotope - atomic number of the isotope The atomic number of curium is 96; and atomic mass is 247 so no of neutrons is...
No. Gallium is an element. The element Gallium has two naturally occuring stable isotopes (69Ga and 71Ga) and abpout 29 unstable isotopes.
Every element has 3 isotopes.
Carbon-12, Carbon-13, and Carbon-14 all occur naturally. However, Carbon-14 is radioactive.