Zr - Zirconium

Zirconium was discovered in 1789 by Martin Klaproth working in Berlin and the pure metal obtained by Berzelius in 1824 in Stockholm. Hafnium free zirconium is used to contain nuclear fuel in reactors.

Atomic number - 40 Density g/mL 6 .49

Atomic weight u 91 .22 Melting point K 2125

Bonding radius A 1 .45 Boiling point K 4682

Atomic radius A 2 .16 Heat of vaporization kJ/mol 590 .88

Ionization Potential V 6 .84 Heat of fusion kJ/mol 16 .9

Electronegativity - 1 .33 Specific heat J/gK 0 .27

The oxide is amphoteric.
Crystal are hexagonal.

Electron config. : [Kr] 4d² 5s²

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

081
15 sec
EC/ECp,7.200
Y-81/Sr-80
80.936768 082
32 sec
EC,4.000 MeV
Y-82
81.931078 083
44 sec
EC/ECp,5.870
Y-83/Sr-82
82.928652 084
25.9 min
EC,2.670 MeV
Y-84
83.923252 085
7.86 min
EC,4.690 MeV
Y-85
84.921470 086
16.5 hr
EC,1.470 MeV
Y-86
85.916467 087
1.68 hr
EC,3.665 MeV
Y-87
86.914815

088
83.4 da
EC,3.623 MeV
Y-88
87.910224 089
78.41 hr
EC,2.832 MeV
Y-89
88.908889 090 51.45%

Stable

89.904702 091 11.22%

Stable

90.905643 092 17.15%

Stable

91.905038 093
1.53E+6 yr
B-,2.893 MeV
Nb-93
92.906475 094 17.38%

Stable

93.906314

095
64.02 da
B-,1.125 MeV
Nb-95
94.908042 096 2.80%
3.9E19 yr
2B-,3.350 MeV
Mo-96
95.908275 097
16.90 hr
B-,2.658 MeV
Nb-97
96.910949 098
30.7 sec
B-,2.261 MeV
Nb-98
97.912757 099
2.1 sec
B-,4.558 MeV
Nb-99
98.916509 100
7.1 sec
B-,3.340 MeV
Nb-100
99.917755 101
2.1 sec
B-,5.490 MeV
Nb-101
100.92113

102
2.9 sec
B-,4.610 MeV
Nb-102
101.92298 103
1.3 sec
B-,6.950 MeV
Nb-103
102.92659 104
1.2 sec
B-,5.900 MeV
Nb-104
103.92882 105
1 sec
B-,8.500 MeV
Nb-105
104.93301 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	-	40		Density	g/mL	6	.49
Atomic weight	u	91	.22	Melting point	K	2125
Bonding radius	A	1	.45	Boiling point	K	4682
Atomic radius	A	2	.16	Heat of vaporization	kJ/mol	590	.88
Ionization Potential	V	6	.84	Heat of fusion	kJ/mol	16	.9
Electronegativity	-	1	.33	Specific heat	J/gK	0	.27
The oxide is amphoteric.				Crystal are hexagonal.
Electron config. : [Kr] 4d² 5s²
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081 15 sec EC/ECp,7.200 Y-81/Sr-80 80.936768	082 32 sec EC,4.000 MeV Y-82 81.931078	083 44 sec EC/ECp,5.870 Y-83/Sr-82 82.928652	084 25.9 min EC,2.670 MeV Y-84 83.923252	085 7.86 min EC,4.690 MeV Y-85 84.921470	086 16.5 hr EC,1.470 MeV Y-86 85.916467	087 1.68 hr EC,3.665 MeV Y-87 86.914815
088 83.4 da EC,3.623 MeV Y-88 87.910224	089 78.41 hr EC,2.832 MeV Y-89 88.908889	090 51.45% Stable 89.904702	091 11.22% Stable 90.905643	092 17.15% Stable 91.905038	093 1.53E+6 yr B-,2.893 MeV Nb-93 92.906475	094 17.38% Stable 93.906314
095 64.02 da B-,1.125 MeV Nb-95 94.908042	096 2.80% 3.9E19 yr 2B-,3.350 MeV Mo-96 95.908275	097 16.90 hr B-,2.658 MeV Nb-97 96.910949	098 30.7 sec B-,2.261 MeV Nb-98 97.912757	099 2.1 sec B-,4.558 MeV Nb-99 98.916509	100 7.1 sec B-,3.340 MeV Nb-100 99.917755	101 2.1 sec B-,5.490 MeV Nb-101 100.92113
102 2.9 sec B-,4.610 MeV Nb-102 101.92298	103 1.3 sec B-,6.950 MeV Nb-103 102.92659	104 1.2 sec B-,5.900 MeV Nb-104 103.92882	105 1 sec B-,8.500 MeV Nb-105 104.93301	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass