Ho - Holmium

A truely rare earth element, holmium is named for Stockholm. Discovered by Per Cleve in 1878 near there.

Atomic number - 67 Density g/mL 8 .8

Atomic weight u 164 .9304 Melting point K 1743

Bonding radius A 1 .58 Boiling point K 2968

Atomic radius A 2 .47 Heat of vaporization kJ/mol 241

Ionization Potential V 6 .018 Heat of fusion kJ/mol 12 .2

Electronegativity - 1 .23 Specific heat J/gK 0 .16

The oxide is a weak base.
Crystal are hexagonal.

Electron config. : [Xe] 4f¹¹ 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 Ho: Click mass number for decay process, product for element page.

144
0.7 sec
EC/ECp,11.800
Dy-144/Tb-143
143.95169 146
3.6 sec
EC/ECp,10.700
Dy-146/Tb-145
145.94396 147
5.8 sec
EC/ECp,8.100
Dy-147/Tb-146
146.93966 148
2.2 sec
EC/ECp,9.400
Dy-148/Tb-147
147.93719 149
21.1 sec
EC,6.014 MeV
Dy-149
148.93379 150
72 sec
EC,7.240 MeV
Dy-150
149.93335 151
35.2 sec
a/EC,5.124
Tb-147/Dy-151
150.93168

152
161.8 sec
a/EC,6.550
Tb-148/Dy-152
151.93174 153
2.02 min
a/EC,4.129
Tb-149/Dy-153
152.93019 154
11.76 min
a/EC,5.751
Tb-150/Dy-154
153.93059 155
48 min
EC,3.102 MeV
Dy-155
154.92907 156
56 min
EC,5.060 MeV
Dy-156
155.92971 157
12.6 min
EC,2.540 MeV
Dy-157
156.92819 158
11.3 min
EC,4.230 MeV
Dy-158
157.92894

159
33.05 min
EC,1.838 MeV
Dy-159
158.92770 160
25.6 min
EC,3.290 MeV
Dy-160
159.92872 161
2.48 hr
EC,1.956 MeV
Dy-161
160.92785 162
15.0 min
EC,2.140 MeV
Dy-162
161.92909 163
4570 yr
EC,1.785 MeV
Dy-163
162.92873 164
29 min
B-/EC,3.890
Er-164/Dy-164
163.93023 165 100%

Stable

164.93031

166
26.763 hr
B-,1.855 MeV
Er-166
165.93228 167
3.1 hr
B-,1.007 MeV
Er-167
166.93312 168
2.99 min
B-,2.910 MeV
Er-168
167.93550 169
4.7 min
B-,2.124 MeV
Er-169
168.93686 170
2.76 min
B-,3.870 MeV
Er-170
169.93961 171
53 sec
B-,3.200 MeV
Er-171
170.94149 172
25 sec
B-,1.479 MeV
Er-172
171.94448

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	-	67		Density	g/mL	8	.8
Atomic weight	u	164	.9304	Melting point	K	1743
Bonding radius	A	1	.58	Boiling point	K	2968
Atomic radius	A	2	.47	Heat of vaporization	kJ/mol	241
Ionization Potential	V	6	.018	Heat of fusion	kJ/mol	12	.2
Electronegativity	-	1	.23	Specific heat	J/gK	0	.16
The oxide is a weak base.				Crystal are hexagonal.
Electron config. : [Xe] 4f¹¹ 6s²
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144 0.7 sec EC/ECp,11.800 Dy-144/Tb-143 143.95169	146 3.6 sec EC/ECp,10.700 Dy-146/Tb-145 145.94396	147 5.8 sec EC/ECp,8.100 Dy-147/Tb-146 146.93966	148 2.2 sec EC/ECp,9.400 Dy-148/Tb-147 147.93719	149 21.1 sec EC,6.014 MeV Dy-149 148.93379	150 72 sec EC,7.240 MeV Dy-150 149.93335	151 35.2 sec a/EC,5.124 Tb-147/Dy-151 150.93168
152 161.8 sec a/EC,6.550 Tb-148/Dy-152 151.93174	153 2.02 min a/EC,4.129 Tb-149/Dy-153 152.93019	154 11.76 min a/EC,5.751 Tb-150/Dy-154 153.93059	155 48 min EC,3.102 MeV Dy-155 154.92907	156 56 min EC,5.060 MeV Dy-156 155.92971	157 12.6 min EC,2.540 MeV Dy-157 156.92819	158 11.3 min EC,4.230 MeV Dy-158 157.92894
159 33.05 min EC,1.838 MeV Dy-159 158.92770	160 25.6 min EC,3.290 MeV Dy-160 159.92872	161 2.48 hr EC,1.956 MeV Dy-161 160.92785	162 15.0 min EC,2.140 MeV Dy-162 161.92909	163 4570 yr EC,1.785 MeV Dy-163 162.92873	164 29 min B-/EC,3.890 Er-164/Dy-164 163.93023	165 100% Stable 164.93031
166 26.763 hr B-,1.855 MeV Er-166 165.93228	167 3.1 hr B-,1.007 MeV Er-167 166.93312	168 2.99 min B-,2.910 MeV Er-168 167.93550	169 4.7 min B-,2.124 MeV Er-169 168.93686	170 2.76 min B-,3.870 MeV Er-170 169.93961	171 53 sec B-,3.200 MeV Er-171 170.94149	172 25 sec B-,1.479 MeV Er-172 171.94448
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass