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匿名 發問於 科學及數學其他 - 科學 · 1 十年前

鈷是什麼?(英文答案)

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  • king
    Lv 7
    1 十年前
    最愛解答

    Cobalt is a hard, lustrous, silver-gray metal, a chemical element with symbol Co. It is found in various ores, and is used in the preparation of magnetic, wear-resistant, and high-strength alloys. Its compounds are used in the production of inks, paints, and varnishes.

    27

    iron ← cobalt → nickel

    -

    Co

    Rh

    圖片參考:http://upload.wikimedia.org/wikipedia/commons/9/9e...

    Periodic Table - Extended Periodic Table

    General

    Name, Symbol, Number

    cobalt, Co, 27

    Chemical series

    transition metals

    Group, Period, Block

    9, 4, d

    Appearance

    metallic with gray tinge

    圖片參考:http://upload.wikimedia.org/wikipedia/commons/thum...

    Atomic mass

    58.933195(5)  g·mol−1

    Electron configuration

    [Ar] 4s2 3d7

    Electrons per shell

    2, 8, 15, 2

    Physical properties

    Density (near r.t.)

    8.90  g·cm−3

    Liquid density at m.p.

    7.75  g·cm−3

    Melting point

    1768 K

    (1495 °C, 2723 °F)

    Boiling point

    3200 K

    (2927 °C, 5301 °F)

    Heat of fusion

    16.06  kJ·mol−1

    Heat of vaporization

    377  kJ·mol−1

    Heat capacity

    (25 °C) 24.81  J·mol−1·K−1

    Vapor pressure

    P(Pa)

    1

    10

    100

    1 k

    10 k

    100 k

    at T(K)

    1790

    1960

    2165

    2423

    2755

    3198

    Atomic properties

    Crystal structure

    hexagonal

    Oxidation states

    2, 3

    (amphoteric oxide)

    Electronegativity

    1.88 (Pauling scale)

    Ionization energies

    (more)

    1st:  760.4  kJ·mol−1

    2nd:  1648  kJ·mol−1

    3rd:  3232  kJ·mol−1

    Atomic radius

    135  pm

    Atomic radius (calc.)

    152  pm

    Covalent radius

    126  pm

    Miscellaneous–

    Magnetic ordering

    ferromagnetic

    Electrical resistivity

    (20 °C) 62.4 n Ω·m

    Thermal conductivity

    (300 K) 100  W·m−1·K−1

    Thermal expansion

    (25 °C) 13.0  µm·m−1·K−1

    Speed of sound (thin rod)

    (20 °C) 4720 m/s

    Young's modulus

    209  GPa

    Shear modulus

    75  GPa

    Bulk modulus

    180  GPa

    Poisson ratio

    0.31

    Mohs hardness

    5.0

    Vickers hardness

    1043  MPa

    Brinell hardness

    700  MPa

    CAS registry number

    7440-48-4

    Selected isotopes

    Main article: Isotopes of cobalt

    iso

    NA

    half-life

    DM

    DE (MeV)

    DP

    56Co

    syn

    77.27 d

    ε

    4.566

    56Fe

    57Co

    syn

    271.79 d

    ε

    0.836

    57Fe

    58Co

    syn

    70.86 d

    ε

    2.307

    58Fe

    59Co

    100%

    Co is stable with 32 neutrons

    60Co

    syn

    5.2714 years

    β-

    2.824

    60Ni

    References

    Notable characteristics

    Cobalt is ferromagnetic with atomic number 27. The Curie temperature is of 1388 K with 1.6~1.7 Bohr magnetons per atom. It is frequently associated with nickel, and both are characteristic ingredients of meteoric iron. Mammals require small amounts of cobalt salts. Cobalt-60, an artificially produced radioactive isotope of cobalt, is an important radioactive tracer and cancer-treatment agent. Cobalt has a relative permeability two thirds that of iron. Metallic cobalt commonly presents a mixture of two crystallographic structures hcp and fcc with a transition temperature hcp→fcc of 722 K.

    Common oxidation states of cobalt include +2 and +3, though +1 is also seen.

    [edit] Applications

    Alloys, such as:

    Superalloys, for parts in gas turbine aircraft engines.

    Corrosion- and wear-resistant alloys.

    High speed steels.

    Cemented carbides (also called hard metals) and diamond tools.

    Magnets and magnetic recording media.

    Alnico magnets.

    Catalysts for the petroleum and chemical industries.

    Electroplating because of its appearance, hardness, and resistance to oxidation.

    Drying agents for paints, varnishes, and inks.

    Ground coats for porcelain enamels.

    Pigments (cobalt blue and cobalt green).

    圖片參考:http://upload.wikimedia.org/wikipedia/commons/thum...

    圖片參考:http://en.wikipedia.org/skins-1.5/common/images/ma...

    Cobalt blue glasshttp://en.wikipedia.org/wiki/Cobalt

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  • 1 十年前

    cobalt (Co)

    資料來源: me
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  • 1 十年前

    Cobalt is a hard, lustrous, silver-gray metal, a chemical element with symbol Co. It is found in various ores, and is used in the preparation of magnetic, wear-resistant, and high-strength alloys. Its compounds are used in the production of inks, paints, and varnishes.

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  • 1 十年前

    鈷的英文是Cobalt.(Co)

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  • 菇仔
    Lv 4
    1 十年前

    cobalt

    簡寫(Co)

    資料來源: periodic table
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  • 1 十年前

    鈷是化學元素之一,化學符號為Co,

    英文好像是cobalt

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  • 1 十年前

    cobalt

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