Assertion: actinium's use | /r/HasProperty | 41.4 cm
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Source sentences:
text: This half-vaporization period grows to 16 hours if it is instead put on a gold or a platinum surface; this may be caused by poorly understood interactions between astatine and these noble metals ^ 3, using the method given by Johnson (simple  The extrapolated molar refractivity of diatomic astatine is 41.4 cm, using the method given by Johnson(simple plot of the values for F, Cl, Br and I vs the cube of their covalent radii).