All isotopes with atomic number greater than _____ are unstable and radioactive.

Name: All isotopes with atomic number greater than _____ are unstable and radioactive.
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All isotopes with atomic number greater than 83 (bismuth) are unstable and radioactive. This is because as the atomic number increases, the nucleus has more protons, which increases the repulsive forces within the nucleus, making it unstable.

All Isotopes with Atomic Number Greater Than _____ Are Unstable