Tc Technetium – Element Information, Facts, Properties, Trends,Uses, Comparison with other elements

43
Tc
Technetium

Technetium

Element 43 of Periodic table is Technetium with atomic number 43, atomic weight 98. Technetium, symbol Tc, has a Simple Hexagonal structure and Silver color. Technetium is a transition metal element. Know everything about Technetium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.

43 Tc - Technetium | SchoolMyKids

Technetium (/tɛkˈniːʃiəm/) is a chemical element with symbol Tc and atomic number 43. It is the element with the lowest atomic number in the periodic table that has no stable isotopes:every form of it is radioactive. Nearly all technetium is produced synthetically, and only minute amounts are found in nature.

How to Locate Technetium 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 43 to find Technetium 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 Technetium on periodic table look for cross section of group 7 and period 5 in the modern periodic table.

Table of Contents

Technetium History

The element Technetium was discovered by Emilio Segrè in year 1937 in Italy . Technetium derived its name from the Greek tekhnètos meaning 'artificial'

Technetium Presence: Abundance in Nature and Around Us

The table below shows the abundance of Technetium 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 None
Abundance in Meteorites None
Abundance in Earth's Crust None
Abundance in Oceans None
Abundance in Humans None

Crystal Structure of Technetium

The solid state structure of Technetium is Simple Hexagonal.

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
273.5 273.5 438.8 pm

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

alpha beta gamma
π/2 π/2 2 π/3

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 P63/mmc 43 Tc Technetium - Crystal Structure | SchoolMyKids
Space Group Number 194
Crystal Structure Simple Hexagonal

Technetium Atomic and Orbital Properties

Technetium atoms have 43 electrons and the electronic shell structure is [2, 8, 18, 13, 2] with Atomic Term Symbol (Quantum Numbers) 6S5/2.

Atomic Number 43
Number of Electrons (with no charge) 43
Number of Protons 43
Mass Number 98
Number of Neutrons 55
Shell structure (Electrons per energy level) [2, 8, 18, 13, 2]
Electron Configuration [Kr] 4d5 5s2
Valence Electrons 4d5 5s2
Oxidation State -3;-1
1;2;3;4;5;6;7
Atomic Term Symbol (Quantum Numbers) 6S5/2

Shell Structure of Technetium - Electrons per energy level

43 Tc Technetium - 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 5
5 O 2

Ground State Electronic Configuration of Technetium - neutral Technetium atom

The ground state electronic configuration of Neutral Technetium atom is [Kr] 4d5 5s2. The portion of Technetium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Kr]. 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 4d5 5s2, electrons in the outermost shell that determine the chemical properties of the element.

Unabbreviated electronic configuration of neutral Technetium

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

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2

Atomic Structure of Technetium

Technetium atomic radius is 183 pm, while it's covalent radius is 156 pm.

Atomic Radius

183 pm (1.83 Å)

Atomic Volume 8.52173913043 cm3
Covalent Radius 156 pm (1.56 Å)
Van der Waals Radius N/A
Neutron Cross Section 22 σa/barns

Atomic Spectrum of Technetium

Atomic Spectrum of Technetium | SchoolMyKids

Technetium Chemical Properties: Technetium Ionization Energies and electron affinity

The electron affinity of Technetium is 53 kJ/mol

Valence 6
Electronegativity 1.9
ElectronAffinity 53 kJ/mol

Ionization Energy of Technetium

Refer to table below for Ionization energies of Technetium

Ionization energy number Enthalpy - kJ/mol
1 702
2 1470
3 2850

Technetium Physical Properties

Refer to below table for Technetium Physical Properties

Density 11.5 g/cm3
Molar Volume 8.52173913043 cm3

Elastic Properties

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

Hardness of Technetium - Tests to Measure of Hardness of Element

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

Technetium Electrical Properties

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

Electrical Conductivity 5×106 S/m
Resistivity 2×10-7 m Ω
Superconducting Point 7.8

Technetium Heat and Conduction Properties

Thermal Conductivity 51 W/(m K)
Thermal Expansion N/A

Technetium Magnetic Properties

Magnetic Type Paramagnetic
Curie Point N/A
Mass Magnetic Susceptibility 3.42×10-8
Molar Magnetic Susceptibility 3.352×10-9
Volume Magnetic Susceptibility 0.0003933

Optical Properties of Technetium

Refractive Index N/A

Acoustic Properties of Technetium

Speed of Sound N/A

Technetium Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Technetium

Melting Point 2430 K (2157 °C)
Boiling Point 4538 K (4265 °C)
Critical Temperature N/A
Superconducting Point 7.8

Enthalpies of Technetium

Heat of Fusion 23 kJ/mol
Heat of Vaporization 550 kJ/mol
Heat of Combustion N/A

Technetium Isotopes - Nuclear Properties of Technetium

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

Isotope Isotope Mass % Abundance T half Decay Mode
85Tc  
86Tc  
87Tc  
88Tc  
89Tc  
90Tc  
91Tc  
92Tc  
93Tc  
94Tc  
95Tc  
96Tc  
97Tc  
98Tc  
99Tc  
100Tc  
101Tc  
102Tc  
103Tc  
104Tc  
105Tc  
106Tc  
107Tc  
108Tc  
109Tc  
110Tc  
111Tc  
112Tc  
113Tc  
114Tc  
115Tc  
116Tc  
117Tc  
118Tc  

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS Number CAS7440-26-8
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) CAS7440-26-8
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