Molybdän

42
Mo
Gruppe
6
Periode
5
Block
d
Protonen
Elektronen
Neutronen
42
42
54
Generelle Eigenschaften
Ordnungszahl
42
Atommasse
95,96
Massenzahl
96
Kategorie
Übergangsmetalle
Farbe
Grau
Radioaktiv
Nein
Aus dem Griechischen molybdo, Führen
Kristallstruktur
Kubisch raumzentriert
Geschichte
Molybdenite was often confused for graphite and it was thought to contain lead.

In 1778 Swedish scientist Carl Wilhelm Scheele proved that molybdenite was not graphite nor did it contain lead.

In 1781, Scheele's friend and countryman, Peter J. Hjelm isolated the metal by using carbon and linseed oil.
Elektronen pro Schale
2, 8, 18, 13, 1
Elektronenkonfiguration
[Kr] 4d5 5s1
Mo
Molybdenum is essential for plant foliage health
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
10,22 g/cm3
Schmelzpunkt
2896,15 K | 2623 °C | 4753,4 °F
Siedepunkt
4912,15 K | 4639 °C | 8382,2 °F
Schmelzwärme
36 kJ/mol
Verdampfungswärme
600 kJ/mol
Spezifische Wärmekapazität
0,251 J/g·K
Häufigkeit in der Erdkruste
0,00011%
Häufigkeit im Universum
5×10-7%
Molybdenum
Danksagungen für Bilder: Images-of-elements
Molybdenum with rough, oxidized surface
CAS-Nummer
7439-98-7
PubChem CID Number
23932
Atomeigenschaften
Atomradius
139 pm
Kovalenter Radius
154 pm
Elektronegativität
2,16 (Pauling-Skala)
Ionisierungsenergie
7,0924 eV
Molares Volumen
9,4 cm3/mol
Wärmeleitfähigkeit
1,38 W/cm·K
Oxidationszustände
-2, -1, 1, 2, 3, 4, 5, 6
Anwendung
Molybdenum is used as glass furnace electrodes due to its high melting point.

The metal is also used in nuclear energy applications and for missile and aircraft parts.

Molybdenum is valuable as a catalyst in the refining of petroleum.

Molybdenum is used in small quantities to harden steel and is used in many alloys.
Molybdenum is toxic in all but small quantities
Isotope
Stabile Isotope
92Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo
Instabile Isotope
83Mo, 84Mo, 85Mo, 86Mo, 87Mo, 88Mo, 89Mo, 90Mo, 91Mo, 93Mo, 99Mo, 100Mo, 101Mo, 102Mo, 103Mo, 104Mo, 105Mo, 106Mo, 107Mo, 108Mo, 109Mo, 110Mo, 111Mo, 112Mo, 113Mo, 114Mo, 115Mo