What element with an atomic number of 88 has no stable isotopes because it decays very rapidly?

Answer Radium

Radium is a radioactive element that was first discovered by French physicist Marie Curie in 1898. It is a chemical element with an atomic number of 88, and it has an atomic mass of 226. Radioactive elements have unstable nuclei, which break down via nuclear disintegration. Radium is so radioactive, that it glows from the energy given off during its decay.

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