Use your knowledge of chemical trends in Group 2 chemistry and data from Table 12.1 to predict the chemistry of radium. Compare your predictions with experimental observations. See, for example, H.W. Kirby and M.L. Salutsky, The radiochemistry of radium. Nuclear Science Series, National Academy of Sciences, National Research Council. National Bureau of Standards, US Department of Commerce (1964). http://library.lanl.gov/cgi-bin/getfile?rc000041.pdf (accessed January 2018).

Table 12.1.

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TABLE 12.1 Selected properties of the Group 2 elements Be 112 27(4) 900 1757 -1.85 1.85 1280 -2500 321 Metallic radius/pm Ionic radius, r (M²+)/pm (coordination number) First ionization energy, /,/kJ mol-¹ Second ionization energy // kJ mol-¹ E (M²+,M)/V Density, p/g cm-3 Melting point/°C AH* (M²+)/kJ mol AubH*/kJ mol-¹ Mg 150 72(6) 736 1450 -2.38 1.74 650 -1920 150 197 100(6) 590 1145 -2.87 1.54 850 -1650 193 Sr 215 126(8) 548 1064 -2.89 2.62 768 -1480 164 Ba 217 142(8) 502 965 -2.90 3.51 714 -1360 176 Ra 220 170(12) 510 978 -2.92 5.00 700 130