Chemical Elements.com - Technetium (Tc)

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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

Number of Energy Levels: 5

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

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 years
Tc-97m	90.0 days
Tc-98	4200000 years
Tc-99	2.13E5 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

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