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physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > transuranium element > americium > americium 239

americium 239 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
americium			radioactive element		radioactive silvery metal which does not occur naturally				Am
americium 239	I = 5/2-	γ		144		239	11.9 hours	americium	239Am	239.053016

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