Mendeleev's Periodic Table > Ac - Actinium

Ac - Actinium

Actinium was discovered by Debierne, 1899, and is dangerously radioactive. The chemical behaviour of actinium is similar to that of the rare earths, particularly lanthanum. It is found naturally in uranium ores and actinium is 150 times more radioactive than radium.

Atomic number	-	89		Density	g/mL	10	.07
Atomic weight	u	227	.0278	Melting point	K	1323
Bonding radius	A	-		Boiling point	K	3473
Atomic radius	A	-		Heat of vaporization	kJ/mol	-
Ionization Potential	V	5	.17	Heat of fusion	kJ/mol	-
Electronegativity	-	1	.1	Specific heat	J/gK	-
The oxide is neutral.				Crystal are face centered cubic.
Electron config. : [Rn] 6d¹ 7s²

Isotopes of Ac (Actinium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	207 22 msec a,6.870 MeV Fr-203 207.0	208 95 msec a,7.720 MeV Fr-204 208.0	209 0.10 sec a/EC,7.730 Fr-205/Ra-209 209.00957	210 0.35 sec a/EC,7.610 Fr-206/Ra-210 210.00925
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	211 0.25 sec a,7.620 MeV Fr-207 211.00764	212 0.93 sec a/EC,7.520 Fr-208/Ra-212 212.00780	213 0.80 sec a,7.500 MeV Fr-209 213.00658	214 8.2 sec a/EC,7.350 Fr-210/Ra-214 214.00689
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	215 0.17 sec a/EC,7.750 Fr-211/Ra-215 215.00645	216 0.33 msec a,9.243 MeV Fr-212 216.00871	217 69 nsec a/EC,9.832 Fr-213/Ra-217 217.00933	218 1.08 usec a,9.380 MeV Fr-214 218.01162
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	219 11.8 usec a,8.830 MeV Fr-215 219.01241	220 26.4 msec a/EC,8.350 Fr-216/Ra-220 220.01475	221 52 msec a,7.780 MeV Fr-217 221.01557	222 5.0 sec a/EC,7.137 Fr-218/Ra-222 222.01782
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	223 2.10 min a/EC,6.783 Fr-219/Ra-223 223.01912	224 2.78 hr a/B-/EC,1.403 Fr-220/Th-224/Ra-224 224.02170	225 10.0 da a,5.935 MeV Fr-221 225.02321	226 29.37 hr a/B-/EC,1.117 Fr-222/Th-226/Ra-226 226.02608
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	227 21.773 yr a/B-,1.325 Fr-223/Th-227 227.02774	228 6.15 hr a/B-,2.127 Fr-224/Th-228 228.03101	229 62.7 min B-,1.100 MeV Th-229 229.03292	230 122 sec B-,2.700 MeV Th-230 230.03602
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	231 7.5 min B-,2.100 MeV Th-231 231.03855	232 119 sec B-,3.700 MeV Th-232 232.04201	233 145 sec B-,7.100 MeV Th-233 233.04466	234 44 sec B-,6.420 MeV Th-234 234.04852

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