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Periodic table of elements

содержание презентации «Periodic table of elements»
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1Some elements of the periodic table.0 11animal dead skin tissues, especially in the feathers.0
2Co.0 12Hf.0
31735 Swedish mineralogist Georg Brandt. history of0 13history of discovery. 1923 French chemist Jean0
discovery. Urbain Danish chemist: Dirk Coster and Georg de Hevesy.
4physical properties. hard metal exists in two0 14physical properties. silvery-white, having a0
versions melting point of 1494 ° C ferromagnetic surface with a bright luster is not fading At ordinary
material. temperatures it has a hexagonal lattice Density = 13.09
5chemical properties. 2Co + O2 = 2CoO. Co + Br2 =0 g/cm3 (20 ° C) refractory metal, its melting
CoBr2. 2Co + N2 = 2CoN. 3Co + C = Co3C. 2Co + 8CO = temperature = 2222 ° C One of the rare natural isotopes
Co2(CO)8. Co + 2H2SO4 = CoSO4 + SO2 + 2H2O. of hafnium, 174Hf, exhibits a weak alpha activity
6biological function. Vital for the body trace0 (half-life of 2.1015 years).
element. It is a part of vitamin B12 (cobalamin). It is 15chemical properties. Other reactions that occur0
involved in blood formation, function of the nervous under the influence of very high temperatures and in
system and liver, enzymatic reactions. The human need practice. It also remains unclear their mechanism. Hf +
for cobalt 0,007-0,015 mg daily. In the absence of 2F2 = HfF4.
cobalt akobaltoz develops. 16not installed. biological function.0
7Ni.0 17He.0
81751 swedish mineralogist Cronstedt. history of0 18history of discovery. August 18, 1868 French0
discovery. scientist Pierre Janssen. October 20, 1868 English
9physical properties. silver-white metal does not0 astronomer Norman Lockyer.
tarnish in air Has a face-centered cubic lattice In its 19physical properties. practically inert chemical0
pure form is very plastic and easy to work pressure. element. nontoxic is colorless, odorless and tasteless
Density (at n. Y.) = 8.902 g / cm ? Melting point = Under normal conditions - monatomic gas Its boiling
1726 K. point (T = 4,215 K for 4He) the lowest of all the
10chemical properties. 2Ni + O2 = 2NiO. Ni + Cl2 =0 simple substances.
NiCl2. 3Ni + N2 = Ni3N2. 2Ni + B = Ni2B. Ni + 4HNO3 = 20inert gas. chemical properties.0
Ni(NO3)2 + 2NO2 + 2H2O. Ni + CuSO4 = NiSO4 + Cu. Ni + 21biological function. At the moment, the biological0
4CO = Ni(CO)4. role is not clear.
11biological function. It is one of trace elements0 22you have viewed the presentation of some chemical0
necessary for the normal development of living elements. Slides prepared for you Kobets TimoPhEy,
organisms. It takes part in enzymatic reactions in Department of Chemistry, the group “MXO-12"
animals and plants. In the body, it accumulates in
22 «Periodic table of elements» | Periodic table of elements 0
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Презентация: Periodic table of elements | Тема: Тексты на английском | Урок: Английский язык | Вид: Фото