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The density of actinium is 10 g/cm3.
Physical Data : [top] Density (lb / cu. in.) 0.098 Specific Gravity 2.7 Melting Point (Deg F) 1090 Modulus of Elasticity Tension 10 Modulus of Elasticity Torsion 3.8
The density is is 1,26699 g/cm3.
Density is mass divided by volume - for example grams per cubic centimeter (or "cc").I will assume that you meant that the volume is 10 cubiccentimeters.Then you get (20 grams) divided by (10 cc) = 2 g/cc
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