Mendeleev's Periodic Table > Ra - Radium

Ra - Radium

Radium metal was isolated by the Curies and Andre Debierne in 1898 in Paris. Pure metallic radium is brilliant white when freshly prepared, but blackens on exposure to air, probably due to formation of the nitride. It exhibits luminescence, as do its salts; it decomposes in water and is somewhat more volatile than barium. Radium imparts a carmine red colour to a flame. Radium emits alpha, beta, and gamma rays and when mixed with beryllium produces neutrons. Inhalation, injection, or body exposure to radium can cause cancer and other body disorders. Radium is over a million times more radioactive than the same mass of uranium.

Atomic number	-	88		Density	g/mL	5
Atomic weight	u	226	.0254	Melting point	K	973
Bonding radius	A	-		Boiling point	K	1809
Atomic radius	A	-		Heat of vaporization	kJ/mol	-
Ionization Potential	V	5	.279	Heat of fusion	kJ/mol	-
Electronegativity	-	0	.9	Specific heat	J/gK	-
The oxide is a strong base.				Crystal are body centered cubic.
Electron config. : [Rn] 7s²

Isotopes of Ra (Radium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	204 45 msec a,7.650 MeV Rn-200 204.00644	205 0.22 sec a/EC,7.510 Rn-201/Fr-205 205.00619	206 0.24 sec a,7.416 MeV Rn-202 206.00378	207 1.3 sec a/EC,7.270 Rn-203/Fr-207 207.00375
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	207a 55 msec EC,6.870 MeV Fr-207 207.00418	208 1.3 sec a/EC,7.273 Rn-204/Fr-208 208.00177	209 4.6 sec a/EC,7.150 Rn-205/Fr-209 209.00194	210 3.7 sec a/EC,7.157 Rn-206/Fr-210 210.00045
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	211 13 sec a/EC,7.046 Rn-207/Fr-211 211.00089	212 13.0 sec a/EC,7.032 Rn-208/Fr-212 211.99978	213 2.74 min a/EC,6.859 Rn-209/Fr-213 213.00034	213a 2.1 msec a,8.629 MeV Rn-209 213.00224
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	214 2.46 sec a/EC,7.273 Rn-210/Fr-214 214.00009	215 1.59 msec a,8.864 MeV Rn-211 215.00270	216 182 nsec a/EC,9.308 Rn-212/Fr-216 216.00351	217 1.7 usec a,9.161 MeV Rn-213 217.00630
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	218 25.6 usec a,8.546 MeV Rn-214 218.00712	219 10 msec a,8.130 MeV Rn-215 219.01006	220 18 msec a,7.595 MeV Rn-216 220.01101	221 28 sec a,6.886 MeV Rn-217 221.01390
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	222 38.0 sec a,6.681 MeV Rn-218 222.01536	223 11.435 da a,5.979 MeV Rn-219 223.01849	224 3.66 da a,5.789 MeV Rn-220 224.02020	225 14.9 da B-,1.866 MeV Ac-225 225.02360
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	226 1600 yr a,4.871 MeV Rn-222 226.02540	227 42.2 min B-,1.325 MeV Ac-227 227.02916	228 5.75 yr B-,4.300 MeV Ac-228 228.03106	229 4.0 min B-,1.760 MeV Ac-229 229.03481
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	230 93 min B-,2.560 MeV Ac-230 230.03708	231 103 sec B-,7.175 MeV Ac-231 231.04139	232 250 sec B-,6.370 MeV Ac-232 232.04411	233 30 sec B-,7.100 MeV Ac-233 233.0
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	234 30 sec B-,6.420 MeV Ac-234 234.05152