Technetium

Technetium
General Info
Atomic Symbol	Atomic symbol::Tc
Atomic Number	Atomic number::43
Atomic Weight	Atomic weight::98 g/mol
Chemical series	Transition Metals
Appearance	silvery grey metal
Group, Period, Block	7, 5, d
Electron configuration	[Kr] 5s2 4d5
Electrons per shell	2, 8, 18, 13, 2
CAS number	CAS number::7440-26-8
Physical properties
Phase	solid
Density	Density::11 g/ml
Melting point	Melting point::2474K
Boiling point	Boiling point::5150K
Isotopes of Technetium
iso NA half-life DT DE (MeV) DP 95mTc syn 61 d ε - 95Mo 95mTc syn 61 d γ 0.204, 0.582, 0.835 - 95mTc syn 61 d IT 0.0389, e 95Tc 96Tc syn 4.3 d ε - 96Mo 96Tc syn 4.3 d γ 0.778, 0.849, 0.812 - 97Tc syn 2.6x106 y ε - 97Mo 97mTc syn 90 d IT 0.965, e 97Tc 98Tc syn 4.2x106 y β- 0.4 98Ru 98Tc syn 4.2x106 y γ 0.745, 0.654 - 99Tc trace 2.111x105 y β- 0.294 99Ru 99mTc trace 6.01 h IT 0.142, 0.002 99Tc 99mTc trace 6.01 h γ 0.140 -
All properties are for STP unless otherwise stated.

Technetium is a radioactive chemical element known by the chemical symbol is Tc. It is perhaps best known for being widely used in diagnostic nuclear medicine.

Properties

This is the first technetium-99m generator

Technetium is a transition metal belonging to group 5, 7a. Element symbol is Tc, and it's atomic weight is 98g/mol. Melting point is 2157℃, and boiling point 4265℃. Density is 11g/cm3 and liquid range is 2108K. Superconduction temperature of technetium is 7.8K. The color of Technetium is silver grey, and they loses it's gloss in humid space. Chemical properties of technetium are similar to rhenium.

Isotopes

Technetium has twenty-two reported isotopes with masses ranging from 90 to 111. All the isotopes of technetium are radioactive. Technetium is the first of artificial radioactive elements, and 19 kinds of known radio nuclides ranging in mass number 92-105. It has a short half-life except 99Tc · 97Tc · 98Tc. The most useful isotope of technetium is 99Tcm. It is used in many medical isotope experiment.

The most stable isotopes are technetium-97, technetium-98, and technetium-99. They have half lives of more than a million years. Isotopes are two or more forms of an element. Isotopes are different from each other. We can find this fact from their mass number. The mass number is the number which is written on the right of the element's name. The mass number represents the number of protons and neutrons in the nucleus of an atom of the element. The number of protons determines the element. But the number of neutrons in the atom of any one element can be different. Each variation is an isotope. Technetium has never been found on Earth. It has been detected in some stars. It can be detected by analyzing the light produced by the stars.

Uses

This picture shows us how technetium used in hospital. Technetium Generators are used in hospitals for the production of an injectable radioactive solution for use in diagnostic imaging.

Technetium is Widely used in diagnostic nuclear medicine. 99Tc is used as a beta-particle source which does not produce gamma rays. The gamma rays can be used as a gamma camera. Technetium is also used for electric corrosion inhibitors of steel and acid ion. Technetium-99m is used in 80 to 90 percent of all diagnostic procedures that use radioactive elements, and it also has a very long half life. Technetium-95 is used as a radioactive tracer. 5 ppm of KTcO4 is able to protect mild carbon steels in aerated distilled water at temperatures up to 250°C limited to closed systems, because technetium is radioactive.

Historical information

Technetium was discovered by Carlo Perrier, Emilio Segre in 1937 in Italy. Technetium was predicted on the basis of the periodic table by Mendeleev. Mendeleev suggested that it should be very similar to manganese. So he said that it should be named 'ekamanganese'. Technetium was reported that it was discovered in 1925, the time when it was named masuranium. Actually, the element was discovered by C. Perrier and Emilio Gino Segre in 1937, Italy. Technetium was the first element to be produced artificially.Their isotopes are all radioactive. It is named after the Greek technetos, meaning artificial.

Video

Basic information about Technetium.