Pa Protactinium – Element Information, Facts, Properties, Trends,Uses, Comparison with other elements

91
Pa
Protactinium

Protactinium

Element 91 of Periodic table is Protactinium with atomic number 91, atomic weight 231.03588. Protactinium, symbol Pa, has a Centered Tetragonal structure and Silver color. Protactinium is a actinide element. Know everything about Protactinium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.

91 Pa - Protactinium | SchoolMyKids

Protactinium is a chemical element with symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds where protactinium is usually present in the oxidation state +5, but can also assume +4 and even +2 or +3 states.

How to Locate Protactinium on Periodic Table

Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 91 to find Protactinium on periodic table.

Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Protactinium on periodic table look for cross section of group N/A and period 7 in the modern periodic table.

Table of Contents

Protactinium History

The element Protactinium was discovered by William Crookes in year 1913 in Germany and United Kingdom . Protactinium derived its name from the Greek protos, 'first', and actinium, which is produced through the radioactive decay of protactinium

Protactinium Presence: Abundance in Nature and Around Us

The table below shows the abundance of Protactinium in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.

  Ppb by weight (1ppb =10^-7 %)
Abundance in Universe N/A
Abundance in Sun N/A
Abundance in Meteorites N/A
Abundance in Earth's Crust 9.9×10-13%
Abundance in Oceans 2×10-23%
Abundance in Humans None

Crystal Structure of Protactinium

The solid state structure of Protactinium is Centered Tetragonal.

The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.

Unit Cell Parameters

The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)

a b c
392.5 392.5 323.8 pm

and the angles between them Lattice Angles (alpha, beta and gamma).

alpha beta gamma
π/2 π/2 π/2

The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.

The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.

Space Group Name I4/mmm 91 Pa Protactinium - Crystal Structure | SchoolMyKids
Space Group Number 139
Crystal Structure Centered Tetragonal

Protactinium Atomic and Orbital Properties

Protactinium atoms have 91 electrons and the electronic shell structure is [2, 8, 18, 32, 20, 9, 2] with Atomic Term Symbol (Quantum Numbers) 4K11/2.

Atomic Number 91
Number of Electrons (with no charge) 91
Number of Protons 91
Mass Number 231
Number of Neutrons 140
Shell structure (Electrons per energy level) [2, 8, 18, 32, 20, 9, 2]
Electron Configuration [Rn] 5f2 6d1 7s2
Valence Electrons 5f2 6d1 7s2
Oxidation State 3;4;5
Atomic Term Symbol (Quantum Numbers) 4K11/2

Shell Structure of Protactinium - Electrons per energy level

91 Pa Protactinium - Electron Shell Structure | SchoolMyKids
n s p d f
1 K 2
2 L 2 6
3 M 2 6 10
4 N 2 6 10 14
5 O 2 6 10 2
6 P 2 6 1
7 Q 2

Ground State Electronic Configuration of Protactinium - neutral Protactinium atom

The ground state electronic configuration of Neutral Protactinium atom is [Rn] 5f2 6d1 7s2. The portion of Protactinium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Rn]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used.This is important as it is the Valence electrons 5f2 6d1 7s2, electrons in the outermost shell that determine the chemical properties of the element.

Unabbreviated electronic configuration of neutral Protactinium

Complete ground state electronic configuration for the Protactinium atom, Unabbreviated electronic configuration

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f2 6d1 7s2

Atomic Structure of Protactinium

Protactinium atomic radius is 180 pm, while it's covalent radius is N/A.

Atomic Radius

180 pm (1.8 Å)

Atomic Volume 15.0316122316 cm3
Covalent Radius N/A
Van der Waals Radius N/A
Neutron Cross Section 500 σa/barns

Atomic Spectrum of Protactinium

Atomic Spectrum of Protactinium | SchoolMyKids

Protactinium Chemical Properties: Protactinium Ionization Energies and electron affinity

The electron affinity of Protactinium is N/A

Valence 5
Electronegativity 1.5
ElectronAffinity N/A

Ionization Energy of Protactinium

Refer to table below for Ionization energies of Protactinium

Ionization energy number Enthalpy - kJ/mol
1 568

Protactinium Physical Properties

Refer to below table for Protactinium Physical Properties

Density 15.37 g/cm3
Molar Volume 15.0316122316 cm3

Elastic Properties

Young Modulus N/A
Shear Modulus N/A
Bulk Modulus N/A
Poisson Ratio N/A

Hardness of Protactinium - Tests to Measure of Hardness of Element

Mohs Hardness N/A
Vickers Hardness N/A
Brinell Hardness N/A

Protactinium Electrical Properties

Protactinium is Conductor of electricity. Refer to table below for the Electrical properties of Protactinium

Electrical Conductivity 5.6×106 S/m
Resistivity 1.8×10-7 m Ω
Superconducting Point 1.4

Protactinium Heat and Conduction Properties

Thermal Conductivity 47 W/(m K)
Thermal Expansion N/A

Protactinium Magnetic Properties

Magnetic Type Paramagnetic
Curie Point N/A
Mass Magnetic Susceptibility 3.25×10-8
Molar Magnetic Susceptibility 7.509×10-9
Volume Magnetic Susceptibility 0.0004995

Optical Properties of Protactinium

Refractive Index N/A

Acoustic Properties of Protactinium

Speed of Sound N/A

Protactinium Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Protactinium

Melting Point 1845 K (1572 °C)
Boiling Point 4273 K (4000 °C)
Critical Temperature N/A
Superconducting Point 1.4

Enthalpies of Protactinium

Heat of Fusion 15 kJ/mol
Heat of Vaporization 470 kJ/mol
Heat of Combustion N/A

Protactinium Isotopes - Nuclear Properties of Protactinium

Isotopes of rhodium. Naturally occurring Protactinium has 1 stable isotope - None.

Isotope Isotope Mass % Abundance T half Decay Mode
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  

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS Number CAS7440-13-3
RTECS Number N/A
DOT Hazard Class N/A
DOT Numbers N/A
EU Number N/A
NFPA Fire Rating N/A
NFPA Hazards N/A
NFPA Health Rating N/A
NFPA Reactivity Rating N/A
Autoignition Point N/A
Flashpoint N/A

Database Search

List of unique identifiers to search the element in various chemical registry databases

Database Identifier number
CAS Number - Chemical Abstracts Service (CAS) CAS7440-13-3
CID Number N/A
Gmelin Number N/A
NSC Number N/A
RTECS Number N/A

List of Elements
1 H - Hydrogen
2 He - Helium
3 Li - Lithium
4 Be - Beryllium
5 B - Boron
6 C - Carbon
7 N - Nitrogen
8 O - Oxygen
9 F - Fluorine
10 Ne - Neon
11 Na - Sodium
12 Mg - Magnesium
13 Al - Aluminium
14 Si - Silicon
15 P - Phosphorus
16 S - Sulfur
17 Cl - Chlorine
18 Ar - Argon
19 K - Potassium
20 Ca - Calcium
21 Sc - Scandium
22 Ti - Titanium
23 V - Vanadium
24 Cr - Chromium
25 Mn - Manganese
26 Fe - Iron
27 Co - Cobalt
28 Ni - Nickel
29 Cu - Copper
30 Zn - Zinc
31 Ga - Gallium
32 Ge - Germanium
33 As - Arsenic
34 Se - Selenium
35 Br - Bromine
36 Kr - Krypton
37 Rb - Rubidium
38 Sr - Strontium
39 Y - Yttrium
40 Zr - Zirconium
41 Nb - Niobium
42 Mo - Molybdenum
43 Tc - Technetium
44 Ru - Ruthenium
45 Rh - Rhodium
46 Pd - Palladium
47 Ag - Silver
48 Cd - Cadmium
49 In - Indium
50 Sn - Tin
51 Sb - Antimony
52 Te - Tellurium
53 I - Iodine
54 Xe - Xenon
55 Cs - Cesium
56 Ba - Barium
57 La - Lanthanum
58 Ce - Cerium
59 Pr - Praseodymium
60 Nd - Neodymium
61 Pm - Promethium
62 Sm - Samarium
63 Eu - Europium
64 Gd - Gadolinium
65 Tb - Terbium
66 Dy - Dysprosium
67 Ho - Holmium
68 Er - Erbium
69 Tm - Thulium
70 Yb - Ytterbium
71 Lu - Lutetium
72 Hf - Hafnium
73 Ta - Tantalum
74 W - Tungsten
75 Re - Rhenium
76 Os - Osmium
77 Ir - Iridium
78 Pt - Platinum
79 Au - Gold
80 Hg - Mercury
81 Tl - Thallium
82 Pb - Lead
83 Bi - Bismuth
84 Po - Polonium
85 At - Astatine
86 Rn - Radon
87 Fr - Francium
88 Ra - Radium
89 Ac - Actinium
90 Th - Thorium
91 Pa - Protactinium
92 U - Uranium
93 Np - Neptunium
94 Pu - Plutonium
95 Am - Americium
96 Cm - Curium
97 Bk - Berkelium
98 Cf - Californium
99 Es - Einsteinium
100 Fm - Fermium
101 Md - Mendelevium
102 No - Nobelium
103 Lr - Lawrencium
104 Rf - Rutherfordium
105 Db - Dubnium
106 Sg - Seaborgium
107 Bh - Bohrium
108 Hs - Hassium
109 Mt - Meitnerium
110 Ds - Darmstadtium
111 Rg - Roentgenium
112 Cn - Copernicium
113 Nh - Nihonium
114 Fl - Flerovium
115 Mc - Moscovium
116 Lv - Livermorium
117 Ts - Tennessine
118 Og - Oganesson
Metalloid
Nonmetals
Other Nonmetals
Halogens Noble Gas
Metals
Alkali Metals Alkaline Earth Metals
Transition Metals Post-Transition Metals
Lanthanide Actinide