What is the highest element number?
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oganesson is the highest element number
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Oganesson has the highest atomic number and highest atomic mass of all known elements. The radioactive oganesson atom is very unstable, and since 2005, only five (possibly six) atoms of the isotope oganesson-294 have been detected.
Atomic number (Z): 118
Atomic radius: empirical: 152 pm (predicted)
Mass number: 294
CAS Number: 54144-19-3
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