Oxygen consists of three stable isotopes: 16O, 17O, and 18O
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Oxygen-16 IS an isotope of oxygen. If you meant to ask the number of isotopes of oxygen, the answer is 3. They are Oxygen-16, -17 and -18. Oxygen-16 is the most abundant of the isotopes.
There is one stable isotope in Niobium, Nb93 there are 28 known isotopes in all.
There are two stable isotopes of californium: californium-249 and californium-251.
There are two stable isotopes of gallium: gallium-69 and gallium-71. Additionally, there are several radioactive isotopes of gallium, but they are unstable and decay over time.
Elements with no stable isotopes include technetium (element 43) and promethium (element 61) and all elements heavier than lead (elements 83 and higher). Bismuth, element 83, is virtually stable with an extremely long half life of 1.9 x 1019 years.