Technetium at Chemical Elements.com 

 

Basic Information


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/cm3
Color: Unknown


Atomic Structure

[Bohr Model of Technetium]  
Number of Energy Levels: 5

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 14
    Fifth Energy Level: 1

Isotopes

Isotope Half Life
Tc-95 20.0 hours
Tc-95m 61.0 days
Tc-96 4.28 days
Tc-96m 51.5 minutes
Tc-97 2600000.0 years
Tc-97m 90.0 days
Tc-98 4200000.0 years
Tc-99 2.13E7 years
Tc-99m 6.0 hours
Tc-100 14.2 minutes

Facts


Date of Discovery: 1937
Discoverer: Carlo Perrier
Name Origin: From the Greek word technętos (artificial)
Uses: Tc-99m is used for radioactive tracing in medicine
Obtained From: Man-made