Technetium, including Technical Data, Safety Data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure,ionization energy, abundance on Earth, conductivity and thermal properties are included.
Technetium is a Block D, Group 7, Period 5 element. The number of electrons in each of Technetium‘s shells is 2, 8, 18, 13, 2 and its electronic configuration is [Kr] 4d5 5s2. In its elemental form Technetium‘s CAS number is 7440-26-8. The Technetium atom has a radius of 135.2.pm and it‘s Van der Waals radius is 200.pm.
Technetium is a Block D, Group 7, Period 5 element. The number of electrons in each of Technetium‘s shells is 2, 8, 18, 13, 2 and its electronic configuration is [Kr] 4d5 5s2. In its elemental form Technetium‘s CAS number is 7440-26-8. The Technetium atom has a radius of 135.2.pm and it‘s Van der Waals radius is 200.pm.
Technetium was discovered by Carlo Perrier and Emilio Segre in 1937. Technetium is produced as a byproduct of the nuclear industry from spent nuclear fuel rods and was the first element to be made artificially. This is indicated by its name which originates from the greek word "technetos" meaning artificial.
Technetium Abundance. The following table shows the abundance of Technetium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope.
|
Isotope
|
Atomic Mass
|
% Abundance on Earth
|
|
Tc-98
|
97.907216
|
-
|
|
Tc-99
|
98.906255
|
-
|
Technetium Safety Data. The safety data for Technetium metal, nanoparticles and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the left margin. Technetium compounds have no biological role.
Ionization Energy. The ionization energy for Technetium (the least required energy to release a single electron from the atom in it‘s ground state in the gas phase) is stated in the following table:
|
1st Ionization Energy
|
702.42 kJ mol-1
|
|
2nd Ionization Energy
|
702.42 kJ mol-1
|
|
3rd Ionization Energy
|
2850.20 kJ mol-1
|
Conductivity. As to Technetium‘s electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @ 20 ?C is 16.9 ?Ocm and its electronegativities (or its ability to draw electrons relative to other elements) is 2.1. The thermal conductivity of Technetium is 50.6 W m-1 K-1.
Thermal Properties of Technetium. The melting point and boiling point for Technetium are statedbelow. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization.
|
Heat of Fusion
|
23.81 kJ mol-1
|
|
Heat of Vaporization
|
585.22 kJ mol-1
|
|
Heat of Atomization
|
678 kJ mol-1
|
|
|
|
|
|
Formula
|
Atomic Number
|
Molecular Weight
|
Electronegativity (Pauling)
|
Density
|
Melting Point
|
Boiling Point
|
Vanderwaals radius
|
Ionic radius
|
Energy of first ionization
|
|
Tc
|
43
|
[98](0) g.mol -1
|
2.1
|
11?g·cm?3
|
2157? °C
|
4265 °C
|
.200 nm
|
- pm
|
702.42 kJ.mol-1
|
|
