copper has 2 stable isotopes
It has 10
No, there are many stable isotopes.
Dubnium is an artificial chemical element and hasn't stable isotopes.
it has 3 stable isotopes
Hydrogen has three isotopes
Natural gallium has 2 stable isotopes
Oxygen consists of three stable isotopes: 16O, 17O, and 18O
There is one stable isotope in Niobium, Nb93 there are 28 known isotopes in all.
Two stable ones, 10 & 11. Several unstable.
one
3