Protactinium Element (Periodic Table)

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Protactinium

Protactinium (Pa) is a chemical element of the periodic table, located in the period 7, and has the atomic number 91. It is the third element in the actinide series. It is a shiny, silvery-gray metal whose name comes from the Greek word “protos”, which means first. It is highly toxic and is counted as one of the radioactive elements.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
 1
H
 2
He
2
 3
Li
 4
Be
 5
B
 6
C
 7
N
 8
O
 9
F
 10
Ne
3
 11
Na
 12
Mg
 13
Al
 14
Si
 15
P
 16
S
 17
Cl
 18
Ar
4
 19
K
 20
Ca
 21
Sc
 22
Ti
 23
V
 24
Cr
 25
Mn
 26
Fe
 27
Co
 28
Ni
 29
Cu
 30
Zn
 31
Ga
 32
Ge
 33
As
 34
Se
 35
Br
 36
Kr
5
 37
Rb
 38
Sr
 39
Y
 40
Zr
 41
Nb
 42
Mo
 43
Tc
 44
Ru
 45
Rh
 46
Pd
 47
Ag
 48
Cd
 49
In
 50
Sn
 51
Sb
 52
Te
 53
I
 54
Xe
6
 55
Cs
 56
Ba
 72
Hf
 73
Ta
 74
W
 75
Re
 76
Os
 77
Ir
 78
Pt
 79
Au
 80
Hg
 81
Tl
 82
Pb
 83
Bi
 84
Po
 85
At
 86
Rn
7
 87
Fr
 88
Ra
 104
Rf
 105
Db
 106
Sg
 107
Bh
 108
Hs
 109
Mt
 110
Ds
 111
Rg
 112
Cn
 113
Nh
 114
Fl
 115
Mc
 116
Lv
 117
Ts
 118
Og
57
La
 58
Ce
 59
Pr
 60
Nd
 61
Pm
 62
Sm
 63
Eu
 64
Gd
 65
Tb
 66
Dy
 67
Ho
 68
Er
 69
Tm
 70
Yb
 71
Lu
89
Ac
 90
Th
 91
Pa
 92
U
 93
Np
 94
Pu
 95
Am
 96
Cm
 97
Bk
 98
Cf
 99
Es
 100
Fm
 101
Md
 102
No
 103
Lr
– f block

FAQs on Protactinium Element

Protactinium
‣ What does protactinium look like?

Appearance: bright silvery metallic luster
‣ Who discovered protactinium? When was the element protactinium discovered?

Prediction: Dimitri Mendeleev (1869)
Discovery and first isolation: Kasimir Fajans and Oswald Helmuth Gohring (1913)
‣ Where is protactinium found on the periodic table?

Protactinium Periodic Table

Location: Protactinium is found in the seventh row of the periodic table, next to the thorium element.
‣ Protactinium atomic number (Z): 91
‣ What is the correct symbol for protactinium?

Symbol: Pa
‣ What is the atomic weight for protactinium?

Standard atomic weight: 231.03588
‣ What block is protactinium in the periodic table?

Block: f-block
‣ What period is protactinium in on the periodic table?

Period: 7
‣ Protactinium atomic radius: empirical: 163 pm
‣ Protactinium covalent radius: 200 pm
‣ What is the melting point of protactinium?

Melting point: 1841 K (1568 °C, 2854 °F)
‣ What is protactinium boiling point?

Boiling point: 4300 K (4027 °C, 7280 °F)
‣ How many shells does protactinium have?

Electrons per shell: 2, 8, 18, 32, 20, 9, 2
‣ What is the electron configuration for protactinium?

Electron configuration: [Rn] 5f2 6d1 7s2
‣ Protactinium ionization energies:1st: 568 kJ/mol
‣ Is protactinium a solid, liquid or gas?

Phase (at r.t): solid
‣ What is the density of the element protactinium?

Density (near r.t): 15.37 g/cm3
‣ Protactinium magnetic ordering: paramagnetic
‣ Protactinium natural occurrence: from decay
‣ Protactinium oxidation state: +4, +5
‣ What is the electronegativity of protactinium?

Electronegativity: Pauling scale: 1.5
‣ Protactinium heat of fusion: 12.34 kJ/mol
‣ Protactinium heat of vaporization: 481 kJ/mol
‣ What is the crystal structure of protactinium?

Crystal structure: body-centered tetragonal
‣ Thermal expansion of protactinium: ~9.9 µm/(m.K) (at r.t)
‣ Thermal conductivity of protactinium: 47 W/(m.K)
‣ Protactinium electrical resistivity: 177 nΩ.m (at 0 °C)
‣ Protactinium CAS number: 7440-13-3

‣ How many isotopes does protactinium have?

Main isotopes of protactinium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
229Pasyn1.5 dε229Th
230Pasyn17.4 dε230Th
231Pa100 %3.276 × 104 yα227Ac
232Pasyn1.31 dβ–232U
233Patrace26.967 dβ–233U
234Patrace6.75 hβ–234U
234Patrace1.17 minβ–234U

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