Ac - Actinium

Discovered by Debierne, 1899.

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: Click mass number for decay process, product for element page.

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	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	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	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	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	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	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
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass