Ir - Iridium

This precious transition metal was discovered by Tennant in 1803 in England. Our students don't encounter iridium in the flesh but appears as an answer to a lab question.

Atomic number - 77 Density g/mL 22 .5

Atomic weight u 192 .22 Melting point K 2716

Bonding radius A 1 .27 Boiling point K 4701

Atomic radius A 1 .87 Heat of vaporization kJ/mol 604

Ionization Potential V 9 .1 Heat of fusion kJ/mol 26 .1

Electronegativity - 2 .2 Specific heat J/gK 0 .13

The oxide is mildly basic.
Crystal are face centered cubic.

Electron config. : [Xe] 4f¹⁴ 5d⁷ 6s²

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

166
5 msec
a,6.700 MeV
Re-162
165.98550 167
5 msec
a/p,6.540 MeV
Re-163/Os-166
166.98164 168

a,6.410 MeV
Re-164
167.97992 169
0.4 sec
a/EC/p,6.280
Re-165/Os-169/Os-168
168.97639 170
1.05 sec
a/EC,6.170
Re-166/Os-170
169.97502 171
1.5 sec
a/EC/p,6.159
Re-167/Os-171/Os-170
170.97180 172
4.4 sec
a/EC,9.800
Re-168/Os-172
171.97069

173
9.0 sec
a/EC,7.400
Re-169/Os-173
172.96770 174
9 sec
a/EC,9.000
Re-170/Os-174
173.96682 175
9 sec
a/EC,6.600
Re-171/Os-175
174.96414 176
8 sec
a/EC,8.000
Re-172/Os-176
175.96349 177
30 sec
a/EC,5.700
Re-173/Os-177
176.96113 178
12 sec
EC,7.200 MeV
Os-178
177.96103 179
79 sec
EC,4.900 MeV
Os-179
178.95909

180
1.5 min
EC,6.400 MeV
Os-180
179.95920 181
4.90 min
EC,4.070 MeV
Os-181
180.95757 182
15 min
EC,5.610 MeV
Os-182
181.95820 183
57 min
EC,3.450 MeV
Os-183
182.95681 184
3.09 hr
EC,4.600 MeV
Os-184
183.95738 185
14.4 hr
EC,2.370 MeV
Os-185
184.95658 186
16.64 hr
EC,3.831 MeV
Os-186
185.95795

187
10.5 hr
EC,1.502 MeV
Os-187
186.95736 188
41.5 hr
EC,2.809 MeV
Os-188
187.95885 189
13.2 da
EC,1.009 MeV
Os-189
188.95871 190
11.78 da
EC,2.000 MeV
Os-190
189.96059 191 37.3%

Stable

190.96059 192
73.830 da
B-/EC,1.460
Pt-192/Os-192
191.96260 192a
1.45 min
B-,1.517 MeV
Pt-192
191.96266

193 62.7%

Stable

192.96292 194
19.28 hr
B-,7.100 MeV
Pt-194
193.96507 195
2.5 hr
B-,1.120 MeV
Pt-195
194.96597 196
52 sec
B-,3.210 MeV
Pt-196
195.96838 196a
1.40 hr
B-,3.620 MeV
Pt-196
195.96882 197
5.8 min
B-,2.155 MeV
Pt-197
196.96963 198
8 sec
B-,4.100 MeV
Pt-198
197.97228

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	-	77		Density	g/mL	22	.5
Atomic weight	u	192	.22	Melting point	K	2716
Bonding radius	A	1	.27	Boiling point	K	4701
Atomic radius	A	1	.87	Heat of vaporization	kJ/mol	604
Ionization Potential	V	9	.1	Heat of fusion	kJ/mol	26	.1
Electronegativity	-	2	.2	Specific heat	J/gK	0	.13
The oxide is mildly basic.				Crystal are face centered cubic.
Electron config. : [Xe] 4f¹⁴ 5d⁷ 6s²
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166 5 msec a,6.700 MeV Re-162 165.98550	167 5 msec a/p,6.540 MeV Re-163/Os-166 166.98164	168 a,6.410 MeV Re-164 167.97992	169 0.4 sec a/EC/p,6.280 Re-165/Os-169/Os-168 168.97639	170 1.05 sec a/EC,6.170 Re-166/Os-170 169.97502	171 1.5 sec a/EC/p,6.159 Re-167/Os-171/Os-170 170.97180	172 4.4 sec a/EC,9.800 Re-168/Os-172 171.97069
173 9.0 sec a/EC,7.400 Re-169/Os-173 172.96770	174 9 sec a/EC,9.000 Re-170/Os-174 173.96682	175 9 sec a/EC,6.600 Re-171/Os-175 174.96414	176 8 sec a/EC,8.000 Re-172/Os-176 175.96349	177 30 sec a/EC,5.700 Re-173/Os-177 176.96113	178 12 sec EC,7.200 MeV Os-178 177.96103	179 79 sec EC,4.900 MeV Os-179 178.95909
180 1.5 min EC,6.400 MeV Os-180 179.95920	181 4.90 min EC,4.070 MeV Os-181 180.95757	182 15 min EC,5.610 MeV Os-182 181.95820	183 57 min EC,3.450 MeV Os-183 182.95681	184 3.09 hr EC,4.600 MeV Os-184 183.95738	185 14.4 hr EC,2.370 MeV Os-185 184.95658	186 16.64 hr EC,3.831 MeV Os-186 185.95795
187 10.5 hr EC,1.502 MeV Os-187 186.95736	188 41.5 hr EC,2.809 MeV Os-188 187.95885	189 13.2 da EC,1.009 MeV Os-189 188.95871	190 11.78 da EC,2.000 MeV Os-190 189.96059	191 37.3% Stable 190.96059	192 73.830 da B-/EC,1.460 Pt-192/Os-192 191.96260	192a 1.45 min B-,1.517 MeV Pt-192 191.96266
193 62.7% Stable 192.96292	194 19.28 hr B-,7.100 MeV Pt-194 193.96507	195 2.5 hr B-,1.120 MeV Pt-195 194.96597	196 52 sec B-,3.210 MeV Pt-196 195.96838	196a 1.40 hr B-,3.620 MeV Pt-196 195.96882	197 5.8 min B-,2.155 MeV Pt-197 196.96963	198 8 sec B-,4.100 MeV Pt-198 197.97228
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass