Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Under oxidizing conditions technetium (VII) will exist as the pertechnetate ion, TcO 4-. 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 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. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. See more. sulfuric acid (H 2 SO 4), is insoluble in hydrochloric acid (HCl) of any strength. Coordination and organometallic complexes. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Technetium is a transition metal in group 7, period 5, and the d-block of the periodic table. The chemical symbol for Technetium is Tc . 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 . The transition metal trends are due to electrons filling an inner d-subshell (here, within the 4th ring), shielding the outer (valence) electrons from the … 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:. Technetium forms a variety of coordination complexes with organic ligands. heptoxide: It has a melting point of 2157 degrees Celsius. Technetium is a silvery-gray metal that tarnishes slowly in moist air.

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). 4 Tc + 7 O 2 → 2 Tc 2 O 7 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.

It is dissolves in Nitric acid, Aqua regia (mixture of nitric acid and hydrochloric acid), and conc.

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.