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Answer:
ISOTOPES
Possible Questions:
Some atoms
Dating material
Uranium has many
They share the same atomic number
They may be radioactive
Some are radioactive
Chemical variants
U-235 and U-238 e.g.
U-235 and U-238
U 235 et al.
Springfield's minor-league team on "The Simpsons"
Springfield's minor league team on "The Simpsons"
Springfield minor leaguers
Protium and tritium, e.g.
Elemental relatives
Deuterium and tritium, to hydrogen
Deuterium and tritium
Chemist's relatives?
Carbon 14 and uranium 235
Carbon 14 and others
Carbon 12 and carbon 14
Atoms with the same number of protons