കൊബാൾട്ട്
കൊബാൾട്ട് ഒരു ലോഹമാണ്. ആവർത്തനപട്ടികയിൽ 27 സ്ഥാനം. കാന്തങ്ങൾ നിമ്മിക്കാൻ ഉപയോഗിക്കുന്നു. കൊബാൾട്ട് ബ്ലൂ എന്ന സംയുക്തം (cobalt(II) aluminate, CoAl2O4) ഗ്ലാസ്സ്, സെറാമിക്, മഷി, പെയിന്റുകൾ എന്നിവക്ക് കടുംനീലനിറം നൽകാൻ ഉപയോഗിക്കിന്നു.
cobalt chips | |||||||||||||||
കൊബാൾട്ട് | |||||||||||||||
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Pronunciation | /ˈkoʊbɒlt/ [1] | ||||||||||||||
Appearance | metallic with gray tinge | ||||||||||||||
Standard atomic weight Ar°(Co) | |||||||||||||||
കൊബാൾട്ട് in the periodic table | |||||||||||||||
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Group | group 9 | ||||||||||||||
Period | period 4 | ||||||||||||||
Block | d-block | ||||||||||||||
Electron configuration | [Ar] 3d7 4s2 | ||||||||||||||
Electrons per shell | 2, 8, 15, 2 | ||||||||||||||
Physical properties | |||||||||||||||
Color | a grayish silver | ||||||||||||||
Phase at STP | Co-wl: solid | ||||||||||||||
Melting point | 1768 K (1495 °C, 2723 °F) | ||||||||||||||
Boiling point | 3200 K (2927 °C, 5301 °F) | ||||||||||||||
Density (near r.t.) | 8.90 g/cm3 | ||||||||||||||
when liquid (at m.p.) | 7.75 g/cm3 | ||||||||||||||
Heat of fusion | 16.06 kJ/mol | ||||||||||||||
Heat of vaporization | 377 kJ/mol | ||||||||||||||
Molar heat capacity | 24.81 J/(mol·K) | ||||||||||||||
Vapor pressure
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Atomic properties | |||||||||||||||
Oxidation states | ഫലകം:Element-symbol-to-oxidation-state-entry | ||||||||||||||
Electronegativity | Pauling scale: 1.88 | ||||||||||||||
Ionization energies |
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Atomic radius | empirical: 135 pm calculated: 152 pm | ||||||||||||||
Covalent radius | 126 pm | ||||||||||||||
Spectral lines of കൊബാൾട്ട് | |||||||||||||||
Other properties | |||||||||||||||
Natural occurrence | primordial | ||||||||||||||
Crystal structure | hexagonal | ||||||||||||||
Thermal expansion | 13.0 µm/(m⋅K) (at 25 °C) | ||||||||||||||
Thermal conductivity | 100 W/(m⋅K) | ||||||||||||||
Electrical resistivity | 62.4 n Ω⋅m (at 20 °C) | ||||||||||||||
Magnetic ordering | ferromagnetic | ||||||||||||||
Young's modulus | 209 GPa | ||||||||||||||
Shear modulus | 75 GPa | ||||||||||||||
Bulk modulus | 180 GPa | ||||||||||||||
Speed of sound thin rod | 4720 m/s (at 20 °C) | ||||||||||||||
Poisson ratio | 0.31 | ||||||||||||||
Mohs hardness | 5.0 | ||||||||||||||
Vickers hardness | 1043 MPa | ||||||||||||||
Brinell hardness | 700 MPa | ||||||||||||||
CAS Number | 7440-48-4 | ||||||||||||||
Isotopes of കൊബാൾട്ട് | |||||||||||||||
Template:infobox കൊബാൾട്ട് isotopes does not exist | |||||||||||||||
റഫറൻസുകൾ
തിരുത്തുക- ↑ Oxford English Dictionary, 2nd Edition 1989.
- ↑ "Standard Atomic Weights: Cobalt". CIAAW. 2017.
- ↑ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (in ഇംഗ്ലീഷ്). doi:10.1515/pac-2019-0603. ISSN 1365-3075.
H | He | ||||||||||||||||||||||||||||||
Li | Be | B | C | N | O | F | Ne | ||||||||||||||||||||||||
Na | Mg | Al | Si | P | S | Cl | Ar | ||||||||||||||||||||||||
K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr | ||||||||||||||
Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe | ||||||||||||||
Cs | Ba | La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn |
Fr | Ra | Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og |
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