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Презентация на тему Periodic table of elements

history of discovery1735Swedish mineralogistGeorg Brandt
Some elements of the periodic table Co history of discovery1735Swedish mineralogistGeorg Brandt physical propertieshard metalexists in two versionsmelting point of 1494 ° Cferromagnetic material chemical properties2Co + O2 = 2CoOCo + Br2 = CoBr22Co + N2 biological functionVital for the body trace element.It is a part of vitamin Ni history of discovery1751swedish mineralogistCronstedt physical propertiessilver-white metaldoes not tarnish in airHas a face-centered cubic latticeIn its chemical properties2Ni + O2 = 2NiO3Ni + N2 = Ni3N22Ni + B biological functionIt is one of trace elements necessary for the normal development Hf history of discovery1923French chemistJean UrbainDanish chemist:Dirk Coster and Georg de Hevesy physical propertiessilvery-white, having a surface with a bright luster is not fadingAt chemical propertiesHf + 2F2 = HfF4Other reactions that occur under the influence biological functionnot installed He history of discoveryAugust 18, 1868French scientistPierre JanssenOctober 20, 1868English astronomerNorman Lockyer physical propertiespractically inert chemical element.nontoxicis colorless, odorless and tastelessUnder normal conditions - chemical propertiesinert gas biological functionAt the moment, the biological role is not clear you have viewed the presentation of some chemical elements.Slides prepared for you
Слайды презентации

Слайд 2 Co

Co

Слайд 3 history of discovery
1735
Swedish mineralogist
Georg Brandt

history of discovery1735Swedish mineralogistGeorg Brandt

Слайд 4 physical properties
hard metal

exists in two versions

melting point of

physical propertieshard metalexists in two versionsmelting point of 1494 ° Cferromagnetic material

1494 ° C

ferromagnetic material


Слайд 5 chemical properties
2Co + O2 = 2CoO
Co + Br2

chemical properties2Co + O2 = 2CoOCo + Br2 = CoBr22Co +

= CoBr2
2Co + N2 = 2CoN
3Co + C =

Co3C

Co + 2H2SO4 = CoSO4 + SO2 + 2H2O

2Co + 8CO = Co2(CO)8


Слайд 6 biological function
Vital for the body trace element.
It is

biological functionVital for the body trace element.It is a part of

a part of vitamin B12 (cobalamin).
It is involved in

blood formation, function of the nervous system and liver, enzymatic reactions.
The human need for cobalt 0,007-0,015 mg daily.
In the absence of cobalt akobaltoz develops.

Слайд 8 history of discovery
1751
swedish mineralogist
Cronstedt

history of discovery1751swedish mineralogistCronstedt

Слайд 9 physical properties
silver-white metal
does not tarnish in air
Has a

physical propertiessilver-white metaldoes not tarnish in airHas a face-centered cubic latticeIn

face-centered cubic lattice
In its pure form is very plastic

and easy to work pressure.
Density (at n. Y.) = 8.902 g / cm ³
Melting point = 1726 K

Слайд 10 chemical properties
2Ni + O2 = 2NiO
3Ni + N2

chemical properties2Ni + O2 = 2NiO3Ni + N2 = Ni3N22Ni +

= Ni3N2
2Ni + B = Ni2B
Ni + 4HNO3 =

Ni(NO3)2 + 2NO2 + 2H2O

Ni + CuSO4 = NiSO4 + Cu

Ni + 4CO = Ni(CO)4

Ni + Cl2 = NiCl2


Слайд 11 biological function
It is one of trace elements necessary

biological functionIt is one of trace elements necessary for the normal

for the normal development of living organisms.
It takes part

in enzymatic reactions in animals and plants.
In the body, it accumulates in animal dead skin tissues, especially in the feathers.

Слайд 13 history of discovery
1923
French chemist
Jean Urbain
Danish chemist:
Dirk Coster and

history of discovery1923French chemistJean UrbainDanish chemist:Dirk Coster and Georg de Hevesy


Georg de Hevesy


Слайд 14 physical properties
silvery-white, having a surface with a bright

physical propertiessilvery-white, having a surface with a bright luster is not

luster is not fading
At ordinary temperatures it has a

hexagonal lattice
Density = 13.09 g/cm3 (20 ° C)
refractory metal, its melting temperature = 2222 ° C
One of the rare natural isotopes of hafnium, 174Hf, exhibits a weak alpha activity (half-life of 2.1015 years)

Слайд 15 chemical properties
Hf + 2F2 = HfF4
Other reactions that

chemical propertiesHf + 2F2 = HfF4Other reactions that occur under the

occur under the influence of very high temperatures and

in practice. It also remains unclear their mechanism.

Слайд 16 biological function
not installed

biological functionnot installed

Слайд 18 history of discovery
August 18, 1868
French scientist
Pierre Janssen
October 20,

history of discoveryAugust 18, 1868French scientistPierre JanssenOctober 20, 1868English astronomerNorman Lockyer

1868
English astronomer
Norman Lockyer


Слайд 19 physical properties
practically inert chemical element.
nontoxic
is colorless, odorless and

physical propertiespractically inert chemical element.nontoxicis colorless, odorless and tastelessUnder normal conditions

tasteless
Under normal conditions - monatomic gas
Its boiling point (T

= 4,215 K for 4He) the lowest of all the simple substances

Слайд 20 chemical properties
inert gas

chemical propertiesinert gas

Слайд 21 biological function
At the moment, the biological role is

biological functionAt the moment, the biological role is not clear

not clear


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