42 Mo 95.951

Molybdenum

TRANSITION METAL

Phase: Solid

Discovered: Carl Wilhelm Scheele

Block: D

Summary

Molybdenum 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.

Appearance: gray metallic

Source: Wikipedia

Physical Properties

Atomic Mass 95.951 u

Density 10.28 g/cm³

Melting Point 2896 K

Boiling Point 4912 K

Molar Heat 24.06 J/(mol·K)

Electron Affinity 72.1 kJ/mol

Ionization Energies

1^st: 684.3 kJ/mol

2^nd: 1560 kJ/mol

3^rd: 2618 kJ/mol

4^th: 4480 kJ/mol

5^th: 5257 kJ/mol

6^th: 6640.8 kJ/mol

7^th: 12125 kJ/mol

8^th: 13860 kJ/mol

9^th: 15835 kJ/mol

10^th: 17980 kJ/mol

11^th: 20190 kJ/mol

12^th: 22219 kJ/mol

13^th: 26930 kJ/mol

14^th: 29196 kJ/mol

15^th: 52490 kJ/mol

16^th: 55000 kJ/mol

17^th: 61400 kJ/mol

18^th: 67700 kJ/mol

19^th: 74000 kJ/mol

20^th: 80400 kJ/mol

21^th: 87000 kJ/mol

22^th: 93400 kJ/mol

23^th: 98420 kJ/mol

24^th: 104400 kJ/mol

25^th: 121900 kJ/mol

26^th: 127700 kJ/mol

27^th: 133800 kJ/mol

28^th: 139800 kJ/mol

29^th: 148100 kJ/mol

30^th: 154500 kJ/mol