Símbolo | Sr |
Número atómico | 38 |
Grupo | 2 (Alcalinotérreos) |
Período | 5 |
Bloque | s |
Clasificación | Alcalinotérreos |
Apariencia | - |
Color | Plata |
Número de protones | 38 p+ |
Número de neutrones | 50 n0 |
Número de electrones | 38 e- |
Fase en STP | Sólido |
Densidad | 2.64 g/cm3 |
Peso atómico | 87.621 u |
Punto de fusión | 1050 K 776.85 °C 1430.33 °F |
Punto de ebullición | 1650 K 1376.85 °C 2510.33 °F |
Entalpía de vaporización | 136.9 kJ/mol |
Electronegatividad (Escala de Pauling) | 0.95 |
Afinidad electrónica | 5.023 kJ/mol |
Estado de oxidación | +1, +2 (a strongly basic oxide) |
Energía de ionización |
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Descubrimiento | William Cruickshank (1787) |
Primer aislamiento | Humphry Davy (1808) |
Descubrimiento de estroncio Both strontium and strontianite are named after Strontian, a village in Scotland near which the mineral was discovered in 1790 by Adair Crawford and William Cruickshank; it was identified as a new element the next year from its crimson-red flame test color. The element was eventually isolated by Sir Humphry Davy in 1808 by the electrolysis of a mixture containing strontium chloride and mercuric oxide, and announced by him in a lecture to the Royal Society on 30 June 1808. In keeping with the naming of the other alkaline earths, he changed the name to strontium. |