Símbolo | As |
Número atómico | 33 |
Grupo | 15 (Familia del nitrógeno) |
Período | 4 |
Bloque | p |
Clasificación | Semimetal |
Apariencia | Metallic grey |
Color | Plata |
Número de protones | 33 p+ |
Número de neutrones | 42 n0 |
Número de electrones | 33 e- |
Fase en STP | Sólido |
Densidad | 5.727 g/cm3 |
Peso atómico | 74.9216 u |
Punto de fusión | - |
Punto de ebullición | - |
Entalpía de vaporización | 32.4 kJ/mol |
Electronegatividad (Escala de Pauling) | 2.18 |
Afinidad electrónica | 77.65 kJ/mol |
Estado de oxidación | −3, −2, −1, 0, +1, +2, +3, +4, +5 (a mildly acidic oxide) |
Energía de ionización |
|
Descubrimiento | Middle-Eastern alchemists (815) |
Descubrimiento de arsénico During the Bronze Age, arsenic was often included in bronze, which made the alloy harder (so-called "arsenical bronze"). The isolation of arsenic was described by Muslim alchemist Jabir ibn Hayyan before 815 AD. Albertus Magnus (Albert the Great, 1193–1280) later isolated the element from a compound in 1250, by heating soap together with arsenic trisulfide. In 1649, Johann Schröder published two ways of preparing arsenic. Crystals of elemental (native) arsenic are found in nature, although rare. |