Question: Predict the missing value (?) for radioactive radium (Ra). The atomic radius, density, and melting point are given for elements in Group IIA/2. Element Atomic

Predict the missing value (?) for radioactive radium (Ra). The atomic radius, density, and melting point are given for elements in Group IIA/2.

Element Atomic Radius 215 pm 217 pm (?) pm Sr Ba Ra Density at 20 Density at 20 C C 2.63 g/mL 3.65 g/mL (?)

Element Atomic Radius 215 pm 217 pm (?) pm Sr Ba Ra Density at 20 Density at 20 C C 2.63 g/mL 3.65 g/mL (?) g/mL Melting Point 769 C 725 C (?) C

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