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physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > actinium > actinium 229
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actinium 229 comparison table
Subject has nuclear spin has decay mode is a kind of has number of neutron has definition has number of nucleon has half life is an instance of has symbol has atomic mass
actinium  radioactive element soft, silvery-white, radioactive metal which glows in the dark   Ac 
actinium 229I = 3/2+γ 140 22962.7 minutesactinium229Ac229.032980

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