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Nickel (Ni)

From Wikipedia, the free encyclopediaNickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile.

Nickel in the periodic table

SymbolNi
Atomic number28
Group10
Period4
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density8.908 g/cm3
Atomic weight58.6934 u
Melting point1728 K
1454.85 °C
2650.73 °F
Boiling point3003 K
2729.85 °C
4945.73 °F

Atomic properties

Electronegativity (Pauling Scale)1.91
Electron affinity111.65 kJ/mol
Oxidation states−2, −1, 0, +1, +2, +3, +4
(a mildly basic oxide)
Ionization energies
1737.1 kJ/mol
2 1753 kJ/mol
3 3395 kJ/mol
4 5300 kJ/mol
5 7339 kJ/mol
6 10400 kJ/mol
7 12800 kJ/mol
8 15600 kJ/mol
9 18600 kJ/mol
10 21670 kJ/mol
11 30970 kJ/mol
12 34000 kJ/mol
13 37100 kJ/mol
14 41500 kJ/mol
15 44800 kJ/mol
16 48100 kJ/mol
17 55101 kJ/mol
18 58570 kJ/mol
19 148700 kJ/mol
20 159000 kJ/mol
21 169400 kJ/mol
22 182700 kJ/mol
23 194000 kJ/mol
24 205600 kJ/mol
25 221400 kJ/mol
26 231490 kJ/mol
27 992718 kJ/mol
28 1039668 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Ar] 3d8 4s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d8 4s2
Electrons per shell2, 8, 16, 2

History

Discovered1751
Discovered byAxel Fredrik Cronstedt
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