Technetium (Tc)

Properties

Abundance
CAS Number	7440-26-8
PubChem CID	na
Atomic Radius	136
Atomic Volume	8.5
Atomic Weight	[98]
Block	d
Boiling Point	4,265
Bulk Modulus
Category	Transition metals
Crystal Structure	Simple Hexagonal
Color	Silver
Covalent Radius	147
Density	11.5
Electrical Resistivity
Electron Configuration	[Kr] 4d⁵ 5s²
Electrons per shell	2, 8, 18, 13, 2
Electronegativity	1.9
Electrons	43
Group	7
Heat of Fusion	23
Heat of Vaporization	550
Ionization Potential	7.28
Magnetic Ordering
Magnetic Susceptibility
Mass	[98]
Mass Number	43
Melting Point	2,157
Name	Technetium
Neutrons	55
Atomic Number	98
Oxidation States	-3, -1, 1, 2, 3, 4, 5, 6, 7
Period	5
Phase	Solid
Poisson Ratio
Protons	43
Shear Modulus
Specific Heat Capacity	-
Symbol	Tc
Thermal Conductivity	0.506
Van der Waals radius
Young's Modulus
Abundance in Earth's crust	na
Abundance in Universe	na

Tc Technetium 43 (98) 7 5 d 43 2172.0 4877.0 [Kr] 4d5 5s2 2 8 18 13 2 11.5 None Silver Hexagonal 1.9 1.51 {"1":"702","2":"1470","3":"2850"} 702 53 156 +7,4,6 1.36 8.5 23.0 502.0 0.24 50.6 1 4.12×10⁶⁶y BetaDecay Solid, Conductor, TransitionMetal, Metal, Radioactive, Synthetic tek-NEE-shi-em Silvery-gray metal. First synthetically produced element. Added to iron in quantities as low as 55 part-per-million transforms the iron into a corrosion-resistant alloy. Made first by bombarding molybdenum with deuterons (heavy hydrogen) in a cyclotron. 0QBlrGva5YQ Technetium

In 1871, existence of gallium was first predicted by Russian chemist Dmitri Mendeleev and called the element eka-aluminum.

Gallium was discovered spectroscopically by French chemist Paul Emile Lecoq de Boisbaudran in 1875 by its characteristic spectrum in an examination of a sphalerite sample.

Later that year, Lecoq obtained the free metal by electrolysis of its hydroxide in potassium hydroxide solution. From the Latin word Gallia, France; also from Latin, gallus, a translation of Lecoq, a cock 43 1937 Carlo Perrier, Emilio Segre Italy From the Greek word "technikos" meaning "artificial"

Isotopes of Gallium

Standard Atomic Weight

[98]

Stable Isotopes

Unstable Isotopes

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

Gallium is considered to be non-toxic

Gallium has a strong tendency to supercool below its melting point / freezing point

Gallium wets glass or porcelain and forms a brilliant mirror when it is painted on glass.

It is widely used in doping semiconductors and producing solid-state devices such as transistors.

Low melting gallium alloys are used in some medical thermometers as non-toxic substitutes for mercury.

Gallium arsenide is capable of converting electricity directly into coherent light.

Technetium on ChemicalAid