Tc Technetium
Element Information, Facts, Properties, Trends, Uses, Comparison with other elements
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.
It belongs to group 7 of the periodic table having trivial name .
Technetium Facts
Read key information and facts about element Technetium
| Name | Technetium |
| Atomic Number | 43 |
| Atomic Symbol | Tc |
| Atomic Weight | 98 |
| Phase | Solid |
| Color | Silver |
| Appearance | shiny gray metal |
| Classification | Transition Metal |
| Group in Periodic Table | 7 |
| Group Name | manganese family |
| Period in Periodic Table | period 5 |
| Block in Periodic Table | d -block |
| Electronic Configuration | [Kr] 4d5 5s2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 13, 2 |
| Melting Point | 2430 K |
| Boiling Point | 4538 K |
| CAS Number | CAS7440-26-8 |
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.
Technetium History
The element Technetium was discovered by C. Perrier and E. Segrè in year 1937 in Italy. Technetium was first isolated by C. Perrier & E.Segrè in 1937. Technetium derived its name from the Greek tekhnètos meaning 'artificial'.
The two discovered a new element in a molybdenum sample that was used in acyclotron, the firstsynthetic elementto be discovered, though it was later found out that it does occur naturally in minuscule trace quantities. It had been predicted by Mendeleev in 1871 as eka-manganese.
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 %) | ppb by atoms (1ppb =10^-7 %) | |
|---|---|---|
| Abundance in Universe | - | - |
| Abundance in Sun | - | - |
| Abundance in Meteorites | - | - |
| Abundance in Earth's Crust | - | - |
| Abundance in Oceans | - | - |
| Abundance in Humans | - | - |
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 pm | 273.5 pm | 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 |
| Space Group Number | 194 |
| Crystal Structure | Simple Hexagonal |
| Number of atoms per unit cell |
The number of atoms per unit cell in a simple cubic, face-centered cubic and body-centred cubic are 1,4,2 respectively.
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 |
| Valence (Valency) | 6 |
| Main Oxidation States | 4, 7 |
| Oxidation States | -3, -1, 0, 1, 2, 3, 4, 5, 6, 7 |
| Atomic Term Symbol (Quantum Numbers) | 6S5/2 |
Bohr Atomic Model of Technetium - Electrons per energy level
| n | s | p | d | f |
|---|
Ground State Electronic Configuration of Technetium - neutral Technetium atom
Abbreviated electronic configuration of Technetium
The ground state abbreviated 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
Electrons are filled in atomic orbitals as per the order determined by the Aufbau principle, Pauli Exclusion Principle and Hund’s Rule.
Atomic Structure of Technetium
Technetium atomic radius is 183 pm, while it's covalent radius is 156 pm.
| Atomic Radius Calculated | 183 pm (1.83 Å) |
| Atomic Radius Empirical | 135 pm (1.35 Å) |
| Atomic Volume | 8.522 cm3/mol |
| Covalent Radius | 156 pm (1.56 Å) |
| Van der Waals Radius | - |
| Neutron Cross Section | 22 |
| Neutron Mass Absorption | - |
Atomic Spectrum of Technetium
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 |
|---|---|
| 1st | 702 |
| 2nd | 1470 |
| 3rd | 2850 |
Technetium Physical Properties
Refer to below table for Technetium Physical Properties
| Density | 11.5 g/cm3 |
| Molar Volume | 8.522 cm3/mol |
Elastic Properties
| Young Modulus | - |
| Shear Modulus | - |
| Bulk Modulus | - |
| Poisson Ratio | - |
Hardness of Technetium - Tests to Measure of Hardness of Element
| Mohs Hardness | - |
| Vickers Hardness | - |
| Brinell Hardness | - |
Technetium Electrical Properties
Technetium is Conductor of electricity. Refer to table below for the Electrical properties ofTechnetium
| Electrical Conductivity | 5000000 S/m |
| Resistivity | 2e-7 m Ω |
| Superconducting Point | 7.8 |
Technetium Heat and Conduction Properties
| Thermal Conductivity | 51 W/(m K) |
| Thermal Expansion | - |
Technetium Magnetic Properties
| Magnetic Type | Paramagnetic |
| Curie Point | - |
| Mass Magnetic Susceptibility | 3.42e-8 m3/kg |
| Molar Magnetic Susceptibility | 3.352e-9 m3/mol |
| Volume Magnetic Susceptibility | 0.0003933 |
Optical Properties of Technetium
| Refractive Index | - |
Acoustic Properties of Technetium
| Speed of Sound | - |
Technetium Thermal Properties - Enthalpies and thermodynamics
Refer to table below for Thermal properties of Technetium
| Melting Point | 2430 K (2156.85°C, 3914.3299999999995 °F) |
| Boiling Point | 4538 K (4264.85°C, 7708.7300000000005 °F) |
| Critical Temperature | - |
| Superconducting Point | 7.8 |
Enthalpies of Technetium
| Heat of Fusion | 23 kJ/mol |
| Heat of Vaporization | 550 kJ/mol |
| Heat of Combustion | - |
Technetium Isotopes - Nuclear Properties of Technetium
Technetium has 34 isotopes, with between 85 and 118 nucleons. Technetium has 1 stable naturally occuring isotopes.
Isotopes of Technetium - Naturally occurring stable Isotopes: None.
| Isotope | Z | N | Isotope Mass | % Abundance | T half | Decay Mode |
|---|---|---|---|---|---|---|
| 85Tc | 43 | 42 | 85 | Synthetic | ||
| 86Tc | 43 | 43 | 86 | Synthetic | ||
| 87Tc | 43 | 44 | 87 | Synthetic | ||
| 88Tc | 43 | 45 | 88 | Synthetic | ||
| 89Tc | 43 | 46 | 89 | Synthetic | ||
| 90Tc | 43 | 47 | 90 | Synthetic | ||
| 91Tc | 43 | 48 | 91 | Synthetic | ||
| 92Tc | 43 | 49 | 92 | Synthetic | ||
| 93Tc | 43 | 50 | 93 | Synthetic | ||
| 94Tc | 43 | 51 | 94 | Synthetic | ||
| 95Tc | 43 | 52 | 95 | Synthetic | ||
| 96Tc | 43 | 53 | 96 | Synthetic | ||
| 97Tc | 43 | 54 | 97 | Synthetic | ||
| 98Tc | 43 | 55 | 98 | Synthetic | 4.12×10^6 years | BetaDecay |
| 99Tc | 43 | 56 | 99 | Synthetic | ||
| 100Tc | 43 | 57 | 100 | Synthetic | ||
| 101Tc | 43 | 58 | 101 | Synthetic | ||
| 102Tc | 43 | 59 | 102 | Synthetic | ||
| 103Tc | 43 | 60 | 103 | Synthetic | ||
| 104Tc | 43 | 61 | 104 | Synthetic | ||
| 105Tc | 43 | 62 | 105 | Synthetic | ||
| 106Tc | 43 | 63 | 106 | Synthetic | ||
| 107Tc | 43 | 64 | 107 | Synthetic | ||
| 108Tc | 43 | 65 | 108 | Synthetic | ||
| 109Tc | 43 | 66 | 109 | Synthetic | ||
| 110Tc | 43 | 67 | 110 | Synthetic | ||
| 111Tc | 43 | 68 | 111 | Synthetic | ||
| 112Tc | 43 | 69 | 112 | Synthetic | ||
| 113Tc | 43 | 70 | 113 | Synthetic | ||
| 114Tc | 43 | 71 | 114 | Synthetic | ||
| 115Tc | 43 | 72 | 115 | Synthetic | ||
| 116Tc | 43 | 73 | 116 | Synthetic | ||
| 117Tc | 43 | 74 | 117 | Synthetic | ||
| 118Tc | 43 | 75 | 118 | Synthetic |
Regulatory and Health - Health and Safety Parameters and Guidelines
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 |
| RTECS Number | - |
| CID Number | - |
| Gmelin Number | - |
| NSC Number | - |
Compare Technetium with other elements
Compare Technetium with all Group 7 elements
Compare Technetium with all Period 5 elements
Compare Technetium with all Transition Metal elements
FAQs
What is the electronic configuration of Technetium?
The electronic configuration of Technetium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2.
What is the abbreviated electronic configuration of Technetium?
The abbreviated electronic configuration of Technetium is [Kr] 4d5 5s2. To form abbreviated notation of electronic configuration, the completely filled subshells are replaced by the noble gas of the preceding period in square brackets.
What is the symbol of Technetium?
Symbol of Technetium is Tc. Technetium is a chemical element with symbol Tc and atomic number 43.
What is the position of Technetium in the Periodic Table?
Technetium is a chemical element with the symbol Tc and atomic number 43. Technetium is the 43 element on the periodic table. It is located in group 7 and period 5 in the modern periodic table.
What is the atomic number of Technetium?
The atomic number of Technetium is 43.
What is the color of Technetium?
Technetium is of Silver color.
Who discovered Technetium?
The element Technetium was discovered by C. Perrier and E. Segrè in year 1937 in Italy. Technetium was first isolated by C. Perrier & E.Segrè in 1937.
How many valence electrons does a Technetium atom have?
Technetium has 6 valence electrons. Technetium has 43 electrons out of which 6 valence electrons are present in the 4d5 5s2 outer orbitals of atom.
What is the melting Point of Technetium?
Melting Point of Technetium is 2430 K.
What is the boiling Point of Technetium?
Boiling Point of Technetium is 4538 K.
What is the melting Point of Technetium in Kelvin?
Melting Point of Technetium in Kelvin is 2430 K.
What is the boiling Point of Technetium in Kelvin?
Boiling Point of Technetium in Kelvin is 4538 K.
What is the electronic configuration of Technetium 43?
The electronic configuration of Technetium will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2.
How do you write the electron configuration for Technetium?
The electronic configuration of Technetium will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2.