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Molybdenum (Mo)

From Wikipedia, the free encyclopediaMolybdenum is a chemical element with symbol Mo and atomic number 42. The name is from Neo-Latin molybdaenum, from Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known throughout history, but the element was discovered (in the sense of differentiating it as a new entity from the mineral salts of other metals) in 1778 by Carl Wilhelm Scheele.

Molybdenum in the periodic table

SymbolMo
Atomic number42
Group6
Period5
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density10.28 g/cm3
Atomic weight95.951 u
Melting point2896 K
2622.85 °C
4753.13 °F
Boiling point4912 K
4638.85 °C
8381.93 °F

Atomic properties

Electronegativity (Pauling Scale)2.16
Electron affinity72.1 kJ/mol
Oxidation states−4, −2, −1, 0, +1, +2, +3, +4, +5, +6
(a strongly acidic oxide)
Ionization energies
1684.3 kJ/mol
2 1560 kJ/mol
3 2618 kJ/mol
4 4480 kJ/mol
5 5257 kJ/mol
6 6640.8 kJ/mol
7 12125 kJ/mol
8 13860 kJ/mol
9 15835 kJ/mol
10 17980 kJ/mol
11 20190 kJ/mol
12 22219 kJ/mol
13 26930 kJ/mol
14 29196 kJ/mol
15 52490 kJ/mol
16 55000 kJ/mol
17 61400 kJ/mol
18 67700 kJ/mol
19 74000 kJ/mol
20 80400 kJ/mol
21 87000 kJ/mol
22 93400 kJ/mol
23 98420 kJ/mol
24 104400 kJ/mol
25 121900 kJ/mol
26 127700 kJ/mol
27 133800 kJ/mol
28 139800 kJ/mol
29 148100 kJ/mol
30 154500 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Kr] 4d5 5s1
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s1
Electrons per shell2, 8, 18, 13, 1

History

Discovered1778
Discovered byCarl Wilhelm Scheele
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