Technetium ¶

AtomicNumber: 43

Element: Technetium

Symbol: Tc

AtomicMass: 98.0

NumberofNeutrons: 55

NumberofProtons: 43

NumberofElectrons: 43

Period: 5

Group: 7.0

Phase: artificial

Radioactive: yes

Natural: nan

Metal: yes

Nonmetal: nan

Metalloid: nan

Type: Transition Metal

AtomicRadius: 2.0

Electronegativity: 1.9

FirstIonization: 7.28

Density: 11.5

MeltingPoint: 2473.15

BoilingPoint: 5150.0

NumberOfIsotopes: 23.0

Discoverer: Perrier and Segr�

Year: 1937.0

SpecificHeat: nan

NumberofShells: 5

NumberofValence: nan