Tecnécio

43
Tc
Grupo
7
Período
5
Bloco
d
Prótons
Elétrons
Nêutrons
43
43
55
Propriedades Gerais
Número atómico
43
Massa atómica relativa
[98]
Número de massa
98
Categoria
Metais de transição
Cor
Prata
Radioativo
Sim
Da palavra grega technetos, artificial
Estrutura cristalina
Hexagonal simples
História
Element 43 was predicted on the basis of the periodic table, and was erroneously reported as having been discovered in 1925, at which time it was named masurium.

The element was actually discovered by Carlo Perrier and Emilio Segrè in 1937.

It was also found in a sample of molybdenum sent by Ernest Lawrence that was bombarded by deuterons in the Berkeley cyclotron.
Elétrons por nível
2, 8, 18, 13, 2
Configuração eletrônica
[Kr] 4d5 5s2
Tc
Technetium was the first element to be produced artificially
Propriedades Físicas
Estado da matéria
Sólido
Densidade
11,5 g/cm3
Ponto de fusão
2430,15 K | 2157 °C | 3914,6 °F
Ponto de ebulição
4538,15 K | 4265 °C | 7709 °F
Entalpia de fusão
23 kJ/mol
Entalpia de vaporização
550 kJ/mol
Calor específico
-
Abundância na Crosta Terrestre
n/a
Abundância no Universo
n/a
Emilio
Créditos de Imagem: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
Número CAS
7440-26-8
Número CID do PubChem
n/a
Propriedades Atómicas
Raio atómico
136 pm
Raio covalente
147 pm
Eletronegatividade
1,9 (Escala de Pauling)
Potencial de ionização
7,28 eV
Volume atômico
8,5 cm3/mol
Condutividade térmica
0,506 W/cm·K
Estados de oxidação
-3, -1, 1, 2, 3, 4, 5, 6, 7
Aplicações
Technetium is used in nuclear medicine to carry out a number of medical tests, mainly relating to imaging and functional studies of internal bodily organs like bone scan.

It is also used industrially for equipment calibration following its approval as a standard beta emitter.

Mild carbon steels may be effectively protected by minute quantities of technetium, but this corrosion protection is limited to closed systems because of technetium's radioactivity.
Technetium is harmful due to its radioactivity
Isótopos
Isótopos Estáveis
-
Isótopos Instáveis
85Tc, 86Tc, 87Tc, 88Tc, 89Tc, 90Tc, 91Tc, 92Tc, 93Tc, 94Tc, 95Tc, 96Tc, 97Tc, 98Tc, 99Tc, 100Tc, 101Tc, 102Tc, 103Tc, 104Tc, 105Tc, 106Tc, 107Tc, 108Tc, 109Tc, 110Tc, 111Tc, 112Tc, 113Tc, 114Tc, 115Tc, 116Tc, 117Tc, 118Tc