Er - Erbium

	Atomic number	-	68			Density	g/mL	9	.05
	Atomic weight	u	167	.26		Melting point	K	1795
	Bonding radius	A	1	.57		Boiling point	K	3136
	Atomic radius	A	2	.45		Heat of vaporization	kJ/mol	261
	Ionization Potential	V	6	.101		Heat of fusion	kJ/mol	19	.9
	Electronegativity	-	1	.24		Specific heat	J/gK	0	.17
	The oxide is weak base.					Crystal are hexagonal.
	Electron config. : [Xe] 4f12 6s2
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Isotopes of Er: Click mass number for decay process, product for element page.

146 1.7 sec EC/ECp,7.000 Ho-146/Dy-145 145.95190	147 2.5 sec EC/ECp,9.100 Ho-147/Dy-146 146.94943	148 4.6 sec EC,6.800 MeV Ho-148 147.94439	149 4 sec EC/ECp,7.700 Ho-149/Dy-148 148.94213	150 18.5 sec EC,4.108 MeV Ho-150 149.93776	151 23.5 sec EC,5.400 MeV Ho-151 150.93741	152 10.3 sec a/EC,4.934 Dy-148/Ho-152 151.93508
153 37.1 sec a/EC,4.803 Dy-149/Ho-153 152.93509	154 3.73 min a/EC,2.032 Dy-150/Ho-154 153.93277	154a 39 nsec a,7.305 MeV Dy-150 153.93602	155 5.3 min a/EC,3.840 Dy-151/Ho-155 154.93320	156 19.5 min a/EC,1.370 Dy-152/Ho-156 155.93118	157 18.65 min a/EC,3.500 Dy-153/Ho-157 156.93194	158 2.29 hr EC,4.410 MeV Ho-158 157.92990
159 36 min EC,2.769 MeV Ho-159 158.93068	160 28.58 hr EC,3.350 MeV Ho-160 159.92908	161 3.21 hr EC,1.956 MeV Ho-161 160.93000	162 0.14% Stable 161.92877	163 75.0 min EC,1.210 MeV Ho-163 162.93002	164 1.61% Stable 163.92919	165 10.36 hr EC,1.394 MeV Ho-165 164.93072
166 33.6% Stable 165.93029	167 22.95% Stable 166.93204	168 26.8% Stable 167.93236	169 9.40 da B-,2.124 MeV Tm-169 168.93458	170 14.9% Stable 169.93546	171 7.516 hr B-,1.490 MeV Tm-171 170.93802	172 49.3 hr B-,1.479 MeV Tm-172 171.93935
173 1.4 min B-,2.600 MeV Tm-173 172.94239	174 3.3 min B-,1.800 MeV Tm-174 173.94406	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.