Ac - Actinium

There is no actinium in our lab. 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

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

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

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

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
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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