Protactinium Element (Periodic Table)

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 dβ232U
233Patrace26.967 dβ233U
234Patrace6.75 hβ234U
234Patrace1.17 minβ234U

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