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| physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > actinium > actinium 228 | 
| actinium 228 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 228 | I = 3+ | γ | 139 | 228 | 6.15 hours | actinium | 228Ac | 228.031015 | 
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