Mendeleev's Periodic Table > Tc - Technetium

Tc - Technetium

Technetium was discovered in platinum ore from Columbia using x-ray spectroscopy by Walter Noddack and Ida Tacke in Berlin. The element was artificially produced in 1937 by Emilio Segrè and Carlo Perrier in Berkeley. Technetium is used for medical scintigraphic imaging. Since its discovery, searches for the element technetium in terrestrial materials have been made without success. Technetium has been found in the spectrum of S-, M-, and N-type stars, and its presence in stellar matter is leading to new theories of the production of heavy elements in the stars. Technetium is a silvery-grey metal that tarnishes slowly in moist air. Until 1960, technetium was available only in small amounts. The chemistry of technetium is related to that of rhenium.

Atomic number	-	43		Density	g/mL	11	.5
Atomic weight	u	98		Melting point	K	2473
Bonding radius	A	1	.27	Boiling point	K	4538
Atomic radius	A	1	.95	Heat of vaporization	kJ/mol	660
Ionization Potential	V	7	.28	Heat of fusion	kJ/mol	24
Electronegativity	-	1	.9	Specific heat	J/gK	0	.21
The oxide is a strong acid.				Crystal are hexagonal.
Electron config. : [Kr] 4d⁵ 5s²

Isotopes of Tc (Technetium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	088 6.4 sec EC,10.100 MeV Mo-88 87.932796	089 12.8 sec EC,7.510 MeV Mo-89 88.927546	090 8.7 sec EC,9.100 MeV Mo-90 89.923778	091 3.14 min EC,6.220 MeV Mo-91 90.918421
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	092 4.23 min EC,7.870 MeV Mo-92 91.915254	093 2.75 hr EC,3.201 MeV Mo-93 92.910248	094 293 min EC,4.256 MeV Mo-94 93.909655	095 20.0 hr EC,1.691 MeV Mo-95 94.907656
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	096 4.28 da EC,2.973 MeV Mo-96 95.907869	096a 51.5 min EC,3.007 MeV Mo-96 95.907906	097 2.6E+6 yr EC,1.934 MeV Mo-97 96.906364	098 4.2E+6 yr B-,1.796 MeV Ru-98 97.907214
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	099 2.111E+5 yr B-,1.357 MeV Ru-99 98.906253	100 15.8 sec B-,3.202 MeV Ru-100 99.907656	101 14.22 min B-,1.614 MeV Ru-101 100.90731	102 5.28 sec B-,4.530 MeV Ru-102 101.90921
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	103 54.2 sec B-,2.660 MeV Ru-103 102.90917	104 18.3 min B-,5.600 MeV Ru-104 103.91144	105 7.6 min B-,3.640 MeV Ru-105 104.91165	106 35.6 sec B-,6.547 MeV Ru-106 105.91435
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	107 21.2 sec B-,4.820 MeV Ru-107 106.91508	108 5.17 sec B-,7.720 MeV Ru-108 107.91847	109 0.87 sec B-,5.990 MeV Ru-109 108.91962	110 0.92 sec B-,8.800 MeV Ru-110 109.92334
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	111 0.30 sec B-,7.000 MeV Ru-111 110.92506	112 0.28 sec B-,10.000 MeV Ru-112 111.92925	113 130 msec B-,8.200 MeV Ru-113 112.93129