Predefinição:Elemento/Rubídio

Rubídio
CríptonRubídioEstrôncio
K
 
 
37
Rb
 
               
               
                                   
                                   
                                                               
                                                               
Rb
Cs
Tabela completaTabela estendida
Aparência
branco cinza


Amostra de rubídio.
Informações gerais
Nome, símbolo, número Rubídio, Rb, 37
Série química Metal alcalino
Grupo, período, bloco 1 (IA), 5, s
Densidade, dureza 1532 kg/m3, 0,3
Número CAS
Número EINECS
Propriedade atómicas
Massa atómica 85,4678(3) u
Raio atómico (calculado) 248 pm
Raio covalente 211 pm
Raio de Van der Waals 2,44 pm
Configuração electrónica
Elétrons (por nível de energia) 2, 8, 18, 8, 1 (ver imagem)
Estado(s) de oxidação 1 (base forte)
Óxido
Estrutura cristalina cúbica centrada no corpo
Propriedades físicas
Estado da matéria sólido
Ponto de fusão 312,46 K
Ponto de ebulição 961 K
Entalpia de fusão 2,192 kJ/mol
Entalpia de vaporização 72,216 kJ/mol
Temperatura crítica  K
Pressão crítica  Pa
Volume molar 55,76×10−6 m3/mol
Pressão de vapor 434 Pa a 1 K
Velocidade do som 1300 m/s a 20 °C
Classe magnética paramagnético
Susceptibilidade magnética
Permeabilidade magnética
Temperatura de Curie  K
Diversos
Eletronegatividade (Pauling) 0,82
Calor específico J/(kg·K)
Condutividade elétrica S/m
Condutividade térmica 58,2 W/(m·K)
1.º Potencial de ionização 403,0 kJ/mol
2.º Potencial de ionização 2633 kJ/mol
3.º Potencial de ionização 3860 kJ/mol
4.º Potencial de ionização 5080 kJ/mol
5.º Potencial de ionização 6850 kJ/mol
6.º Potencial de ionização 8140 kJ/mol
7.º Potencial de ionização 9570 kJ/mol
8.º Potencial de ionização 13120 kJ/mol
9.º Potencial de ionização 14500 kJ/mol
10.º Potencial de ionização 26740 kJ/mol
Isótopos mais estáveis
iso AN Meia-vida MD Ed PD
MeV
83Rbsintético86,2 dε
γ

0,52; 0,53; 0,55
83Kr
-
84Rbsintético32,9 dε
β+
γ
β

1,66; 0,78
0,881
0,892
84Kr
84Kr
-
84Sr
85Rb72,168%estável com 48 neutrões
86Rbsintético18,65 dβ
γ
1,775
1,0767
86Sr
-
87Rb27,835%4,88×1010 aβ0,28387Sr
Unidades do SI & CNTP, salvo indicação contrária.

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