Make your own free website on


Information valid for Tc-98 unless otherwise noted

Basic Information

Symbol: Tc
Atomic Number: 43
Mass: (98.0)
Melting Point: 2200.0 C
Boiling Point: 4877.0 C
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

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


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


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