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#actinium
#radioactive metal
#silvery metal
#metallic element
#ac
#element 89
#radioactivity
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#nickel metal
#alloy
#industrial metal
#coinage metal
#silvery metal
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#element 38
#sr
#atomic number 38
#alkaline earth metal
#silvery metal
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#strontium bones
#calcium substitute
#element 38
#sr
#silvery metal
#alkaline earth metal
#osteoporosis
#actinium #radioactive metal #silvery metal #metallic element #ac #element 89 #radioactivity