Answer:
Isotopes of Hydrogen:
Hydrogen
Deuterium
Tritium
Isotopes of Carbon:
Carbon - 12
Carbon - 13
Carbon - 14
Isotopes of Uranium:
Uranium - 234
Uranium - 235
Uranium - 238
Isotopes of Lithium:
Lithium - 6
Lithium - 7
Isotopes of Neon:
Neon - 20
Neon - 21
Neon - 22
Isotopes of Magnesium:
Magnesium - 24
Magnesium - 25
Magnesium - 26
There are many many other isotopes.