Protaktinij (Pa)

element with symbol Pa and atomic number of 91

Atomski broj	91
Relativna atomska masa	231.03588
Maseni broj	231

Skupina
Perioda	7
Blok	f

proton	91 p⁺
neutron	140 n⁰
elektron	91 e^-

Animated Bohrov model atoma of Pa (Protaktinij)

Physical Property

Atomski Radijus	180 pm 285 pm
Molni volumen	15 cm³/mol
Kovalentni Radijus	169 pm 138 pm 129 pm 200 pm
Metallic Radius
Ionski radijus	104 pm 90 pm 101 pm 78 pm 91 pm 95 pm 119,9 pm
Crystal Radius	118 pm 104 pm 115 pm 92 pm 105 pm 109 pm 133,9 pm
Van der Waals radius	243 pm 264 pm 342,4 pm
gustoća	15,4 g/cm³

Kemijsko Svojstvo

energija

proton affinity
Elektronski afinitet
ionization energy	5,89 eV/particle 11,9 eV/particle 19 eV/particle 30,9 eV/particle 44,3 eV/particle 72 eV/particle 85,1 eV/particle 98,9 eV/particle 111 eV/particle 137 eV/particle 153 eV/particle 187 eV/particle 203 eV/particle 292 eV/particle 316 eV/particle 342 eV/particle 369 eV/particle 395 eV/particle 423 eV/particle 460 eV/particle 488 eV/particle 518 eV/particle 546 eV/particle 690 eV/particle 720 eV/particle 760 eV/particle 790 eV/particle 880 eV/particle 920 eV/particle 1.020 eV/particle 1.060 eV/particle 1.150 eV/particle 1.220 eV/particle 1.300 eV/particle 1.370 eV/particle 1.450 eV/particle 1.520 eV/particle 1.600 eV/particle 1.670 eV/particle 1.760 eV/particle 1.830 eV/particle 1.910 eV/particle 2.000 eV/particle 2.060 eV/particle 2.130 eV/particle 2.483 eV/particle 2.550 eV/particle 2.620 eV/particle 2.696 eV/particle 2.766 eV/particle 2.837 eV/particle 2.968 eV/particle 3.040 eV/particle 3.119 eV/particle 3.193 eV/particle 3.488 eV/particle 3.558 eV/particle 3.637 eV/particle 3.709 eV/particle 4.077 eV/particle 4.161 eV/particle 4.370 eV/particle 4.454 eV/particle 7.181 eV/particle 7.341 eV/particle 7.510 eV/particle 7.690 eV/particle 7.870 eV/particle 8.040 eV/particle 8.410 eV/particle 8.590 eV/particle 8.780 eV/particle 8.960 eV/particle 9.460 eV/particle 9.620 eV/particle 9.790 eV/particle 9.950 eV/particle 11.100 eV/particle 11.280 eV/particle 11.660 eV/particle 11.840 eV/particle 24.660 eV/particle 25.080 eV/particle 25.540 eV/particle 25.970 eV/particle 30.230 eV/particle 30.800 eV/particle 31.520 eV/particle 31.971,6 eV/particle 126.296,6 eV/particle 128.507 eV/particle

Toplina isparivanja	481,2 kJ/mol
toplina taljenja	16,7 kJ/mol
standard enthalpy of formation	563 kJ/mol
elektron

Elektronska ljuska	2, 8, 18, 32, 20, 9, 2

valence electron	2 ⓘ

electron configuration	[Rn] 5f² 6d¹ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f² 6d¹ 7s²

Oksidacijski broj	2, 3, 4, 5
Elektronegativnost	0.12149 1.5
Electrophilicity Index
fundamental state of matter

agregatno stanje	Čvrsto
gaseous state of matter
Vrelište
Talište	1.845,15 K
critical pressure
critical temperature
Trojna točka
appearance
boja	Srebrna #ffffff #00a1ff #00a1ff
appearance	bright, silvery metallic luster
Indeks prelamanja
thermodynamic material property
Toplinska vodljivost
Toplinsko istezanje
molar heat capacity
Specifični toplinski kapacitet
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	5,6 MS/m
Električna otpornost i provodnost	0,00000018 m Ω
Supravodljivost	1,41 K
Magnetizam
type	paramagnetic
Magnetna susceptibilnost (Mass)	0,0000000325 m³/Kg
Magnetna susceptibilnost (Molar)	0,000000007509 m³/mol
Magnetna susceptibilnost (Volume)	0,0004995
magnetic ordering
Curieva temperatura
Néel temperature
struktura
Kristalna struktura	Prostorno centrirana tetragonska (TET)
lattice constant	3,92 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
Tvrdoća
bulk modulus
shear modulus
Youngov modul elastičnosti
Poissonov omjer
brzina zvuka
classification
Kategorija	Aktinoidi, Actinides
CAS Group
IUPAC Group
Glawe Number	35
Mendeleev Number	18
Pettifor Number	46
Geochemical Class	U/Th decay series
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	154 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Nuklearni udarni presjek	200
Neutron Mass Absorption
Kvantni brojevi	4K11/2
space group	139 (I4/mmm)

Isotopes of Protactinium

Stabilni izotopi	0
Nestabilni izotopi	31
Natural Isotopes	1

²¹¹Pa

Maseni broj	211
neutron number	120
Relativna atomska masa	211,023674036 ± 0,000074581 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	6 ± 3 ms
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	2006
Parnost	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
p (proton emission)

²¹²Pa

Maseni broj	212
neutron number	121
Relativna atomska masa	212,023184819 ± 0,000094047 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	5,8 ± 1,9 ms
spin	3
nuclear quadrupole moment
vrijeme otkrića ili izuma	1997
Parnost	+

decay mode	intensity
α (α emission)	100%

²¹³Pa

Maseni broj	213
neutron number	122
Relativna atomska masa	213,021099644 ± 0,000061374 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	7,4 ± 2,4 ms
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1995
Parnost	-

decay mode	intensity
α (α emission)	100%

²¹⁴Pa

Maseni broj	214
neutron number	123
Relativna atomska masa	214,020891055 ± 0,00008718 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	17 ± 3 ms
spin	7
nuclear quadrupole moment
vrijeme otkrića ili izuma	1995
Parnost	+

decay mode	intensity
α (α emission)	100%

²¹⁵Pa

Maseni broj	215
neutron number	124
Relativna atomska masa	215,019113955 ± 0,000088513 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	14 ± 2 ms
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1979
Parnost	-

decay mode	intensity
α (α emission)	100%

²¹⁶Pa

Maseni broj	216
neutron number	125
Relativna atomska masa	216,019134633 ± 0,000026459 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	105 ± 12 ms
spin	5
nuclear quadrupole moment
vrijeme otkrića ili izuma	1972
Parnost	+

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²¹⁷Pa

Maseni broj	217
neutron number	126
Relativna atomska masa	217,018309024 ± 0,000013417 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	3,8 ± 0,2 ms
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1968
Parnost	-

decay mode	intensity
α (α emission)	100%
β⁻ (β⁻ decay)

²¹⁸Pa

Maseni broj	218
neutron number	127
Relativna atomska masa	218,020021133 ± 0,000019158 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	108 ± 5 us
spin	8
nuclear quadrupole moment
vrijeme otkrića ili izuma	1979
Parnost	-

decay mode	intensity
α (α emission)	100%

²¹⁹Pa

Maseni broj	219
neutron number	128
Relativna atomska masa	219,019949909 ± 0,000074831 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	56 ± 9 ns
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	2005
Parnost	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²²⁰Pa

Maseni broj	220
neutron number	129
Relativna atomska masa	220,021769753 ± 0,000015732 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	0,85 ± 0,06 us
spin	1
nuclear quadrupole moment
vrijeme otkrića ili izuma	2005
Parnost	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²²¹Pa

Maseni broj	221
neutron number	130
Relativna atomska masa	221,021873393 ± 0,000063746 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	5,9 ± 1,7 us
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1983
Parnost	-

decay mode	intensity
α (α emission)	100%

²²²Pa

Maseni broj	222
neutron number	131
Relativna atomska masa	222,023687064 ± 0,000092975 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	3,8 ± 0,2 ms
spin	1
nuclear quadrupole moment
vrijeme otkrića ili izuma	1970
Parnost	-

decay mode	intensity
α (α emission)	100%

²²³Pa

Maseni broj	223
neutron number	132
Relativna atomska masa	223,023980414 ± 0,000081193 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	5,3 ± 0,3 ms
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1970
Parnost	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²²⁴Pa

Maseni broj	224
neutron number	133
Relativna atomska masa	224,025617286 ± 0,000008145 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	844 ± 19 ms
spin	5
nuclear quadrupole moment
vrijeme otkrića ili izuma	1958
Parnost	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²²⁵Pa

Maseni broj	225
neutron number	134
Relativna atomska masa	225,026147927 ± 0,000087887 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,71 ± 0,1 s
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1958
Parnost	-

decay mode	intensity
α (α emission)	100%

²²⁶Pa

Maseni broj	226
neutron number	135
Relativna atomska masa	226,027948217 ± 0,000012037 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,8 ± 0,2 m
spin	1
nuclear quadrupole moment
vrijeme otkrića ili izuma	1949
Parnost	-

decay mode	intensity
α (α emission)	74%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	26%

²²⁷Pa

Maseni broj	227
neutron number	136
Relativna atomska masa	227,028803586 ± 0,000007797 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	38,3 ± 0,3 m
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1948
Parnost	-

decay mode	intensity
α (α emission)	85%
ϵ (electron capture)	15%

²²⁸Pa

Maseni broj	228
neutron number	137
Relativna atomska masa	228,031050758 ± 0,000004659 Da
g-factor	1,1666666666667 ± 0,16666666666667
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	22 ± 1 h
spin	3
nuclear quadrupole moment
vrijeme otkrića ili izuma	1948
Parnost	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	98.15%
α (α emission)	1.85%

²²⁹Pa

Maseni broj	229
neutron number	138
Relativna atomska masa	229,032095585 ± 0,000003521 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,55 ± 0,04 d
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1949
Parnost	+

decay mode	intensity
ϵ (electron capture)	99.51%
α (α emission)	0.49%

²³⁰Pa

Maseni broj	230
neutron number	139
Relativna atomska masa	230,034539717 ± 0,000003261 Da
g-factor	1 ± 0,1
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	17,4 ± 0,5 d
spin	2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1948
Parnost	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	92.2%
β⁻ (β⁻ decay)	7.8%
α (α emission)	0.0032%

²³¹Pa

Maseni broj	231
neutron number	140
Relativna atomska masa	231,0358825 ± 0,000001901 Da
g-factor	1,3266666666667 ± 0,013333333333333
natural abundance	100
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	32,65 ± 0,2 ky
spin	3/2
nuclear quadrupole moment	−1,72 ± 0,05
vrijeme otkrića ili izuma	1918
Parnost	-

decay mode	intensity
α (α emission)	100%
SF (spontaneous fission)	3%
24Ne (heavy cluster emission)	13.4%
23F	9.9%

²³²Pa

Maseni broj	232
neutron number	141
Relativna atomska masa	232,038590205 ± 0,000008206 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,32 ± 0,02 d
spin	2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1949
Parnost	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
ϵ (electron capture)

²³³Pa

Maseni broj	233
neutron number	142
Relativna atomska masa	233,040246535 ± 0,000001433 Da
g-factor	2,6666666666667 ± 0,46666666666667
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	26,975 ± 0,013 d
spin	3/2
nuclear quadrupole moment	−3 ± 0,4
vrijeme otkrića ili izuma	1938
Parnost	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³⁴Pa

Maseni broj	234
neutron number	143
Relativna atomska masa	234,043305555 ± 0,000004395 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	6,7 ± 0,05 h
spin	4
nuclear quadrupole moment
vrijeme otkrića ili izuma	1913
Parnost	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³⁵Pa

Maseni broj	235
neutron number	144
Relativna atomska masa	235,045399 ± 0,000015 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	24,4 ± 0,2 m
spin	3/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1950
Parnost	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³⁶Pa

Maseni broj	236
neutron number	145
Relativna atomska masa	236,048668 ± 0,000015 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	9,1 ± 0,1 m
spin	1
nuclear quadrupole moment
vrijeme otkrića ili izuma	1963
Parnost

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ SF (β⁻-delayed fission)	6%

²³⁷Pa

Maseni broj	237
neutron number	146
Relativna atomska masa	237,051023 ± 0,000014 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	8,7 ± 0,2 m
spin	1/2
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1954
Parnost	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³⁸Pa

Maseni broj	238
neutron number	147
Relativna atomska masa	238,054637 ± 0,000017 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	2,28 ± 0,09 m
spin	3
nuclear quadrupole moment
vrijeme otkrića ili izuma	1968
Parnost	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ SF (β⁻-delayed fission)	2.6%

²³⁹Pa

Maseni broj	239
neutron number	148
Relativna atomska masa	239,05726 ± 0,00021 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,8 ± 0,5 h
spin	1/2
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1995
Parnost	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²⁴⁰Pa

Maseni broj	240
neutron number	149
Relativna atomska masa	240,061203 ± 0,000215 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	3
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost	+

decay mode	intensity
β⁻ (β⁻ decay)

²⁴¹Pa

Maseni broj	241
neutron number	150
Relativna atomska masa	241,064134 ± 0,000322 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	1/2
nuclear quadrupole moment	0
vrijeme otkrića ili izuma
Parnost	+

decay mode	intensity
β⁻ (β⁻ decay)

povijest

otkrio/izumio	Fredrich Soddy, John Cranston, Otto Hahn, Lise Meitner
location of discovery	England/France
vrijeme otkrića ili izuma	1917
Etimologija	Greek: proto and actinium (parent of actinium); it forms actinium when it radioactively decays.
pronunciation	PRO-tak-tin-eh-em (engleski)

source

Obilnost
Zastupljenost u Zemljinoj kori	0,0000014 mg/kg
natural abundance (ocean)	0,00000000005 mg/L
natural abundance (tijelo)	0 %
natural abundance (meteoroid)
natural abundance (Sunce)
Zastupljenost u svemiru	0 %

Nuclear Screening Constants

Protaktinij on ChemicalAid

Australian Educational Vocabulary ID	scot/3563
CAB ID	7539
CAS registarski broj	7440-13-3
ChEBI ID	33386
ChemSpider ID	22387
DSSTOX compound identifier	DTXCID50147878
DSSTox substance ID	DTXSID50225387
Den Store Danske ID	protactinium
ECHA Substance Infocard ID	100.122.906
Elhuyar ZTH ID	030190
Encyclopedia of China ID (Second Edition)	224618
Encyclopædia Universalis ID	protactinium
Freebase ID	/m/025s7xw
French Vikidia ID	Protactinium
GND identifikator	4175981-3
Gran Enciclopèdia Catalana ID	0135204
Great Russian Encyclopedia Online ID	3168919
ID oznaka teme na Quori	Protactinium
ID oznaka u mrežnoj enciklopediji Britannici	science/protactinium
InChI	InChI=1S/Pa
InChIKey	XLROVYAPLOFLNU-UHFFFAOYSA-N
KBpedia ID	Protactinium
LCCN	sh85107634
MeSH ID	D011478
NALT ID	3207
Namuwiki ID	프로트악티늄
National Library of Israel J9U ID	987007541390005171
OpenAlex ID	C505015426
PubChem ID	23945
Römpp online ID	RD-16-04500
Store norske leksikon ID	protactinium
Treccani ID	protoattinio
UNII	0S6855V29M
USGS Thesaurus ID	1547
WordNet 3.1 Synset ID	14675887-n
značenje prema OmegaWiki	345414

Protaktinij (Pa)

Physical Property

Kemijsko Svojstvo

other

Isotopes of Protactinium

211Pa

212Pa

213Pa

214Pa

215Pa

216Pa

217Pa

218Pa

219Pa

220Pa

221Pa

222Pa

223Pa

224Pa

225Pa

226Pa

227Pa

228Pa

229Pa

230Pa

231Pa

232Pa

233Pa

234Pa

235Pa

236Pa

237Pa

238Pa

239Pa

240Pa

241Pa

povijest

source

Nuclear Screening Constants

²¹¹Pa

²¹²Pa

²¹³Pa

²¹⁴Pa

²¹⁵Pa

²¹⁶Pa

²¹⁷Pa

²¹⁸Pa

²¹⁹Pa

²²⁰Pa

²²¹Pa

²²²Pa

²²³Pa

²²⁴Pa

²²⁵Pa

²²⁶Pa

²²⁷Pa

²²⁸Pa

²²⁹Pa

²³⁰Pa

²³¹Pa

²³²Pa

²³³Pa

²³⁴Pa

²³⁵Pa

²³⁶Pa

²³⁷Pa

²³⁸Pa

²³⁹Pa

²⁴⁰Pa

²⁴¹Pa