Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Technetium-99m (99m Tc) is a metastable nuclear isomer of technetium-99 (itself an isotope of technetium), symbolized as 99m Tc, that is used in tens of millions of medical diagnostic procedures annually, making it the most commonly used medical radioisotope.. Technetium-99m is used as a radioactive tracer and can be detected in the body by medical equipment (gamma cameras). Name: Technetium Symbol: Tc Atomic Number: 43 Atomic Mass: (98.0) amu Melting Point: 2200.0 °C (2473.15 K, 3992.0 °F) Boiling Point: 4877.0 °C (5150.15 K, 8810.6 °F) Number of Protons/Electrons: 43 Number of Neutrons: 55 Classification: Transition Metal Crystal Structure: Hexagonal Density @ 293 K: 11.5 g/cm 3 Color: Unknown Atomic Structure

Coordination and organometallic complexes. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. See more. The chemical symbol for Technetium is Tc .

sulfuric acid (H 2 SO 4), is insoluble in hydrochloric acid (HCl) of any strength. Metallic technetium slowly tarnishes in moist air and, in powder form, burns in oxygen.Two oxides have been observed: TcO 2 and Tc 2 O 7.Under oxidizing conditions, which tend to strip electrons from atoms, technetium(VII) exists as the pertechnetate ion, TcO − 4.. At temperatures of 400–450 °C, technetium oxidizes to form the pale-yellow heptoxide:. 4 Tc + 7 O 2 → 2 Tc 2 O 7 It has a melting point of 2157 degrees Celsius. Technetium is a transition metal in group 7, period 5, and the d-block of the periodic table. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Every technetium atom makes six bonds, and the remaining valence electrons can be saturated by one axial and two bridging ligand halogen atoms such as chlorine or bromine. Technetium is a silvery-gray metal that tarnishes slowly in moist air.

Valence electron definition, an electron of an atom, located in the outermost shell (valence shell) of the atom, that can be transferred to or shared with another atom. Metallic technetium slowly tarnishes in moist air, and in powder form, will burn in oxygen.Two oxides have been observed: TcO 2 and Tc 2 O 7.Under oxidizing conditions, which tend to strip electrons from atoms, technetium(VII) will exist as the pertechnetate ion, TcO − 4.. At temperatures of 400–450 °C, technetium oxidizes to form the pale-yellow .