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physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > actinium > actinium 225
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actinium 225 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 use has atomic mass
actinium  radioactive element soft, silvery-white, radioactive metal which glows in the dark   Ac  
actinium 225I = 3/2+γ 136 22510.0 daysactinium225Actracer225.023205

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