成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

Scandium

SCANDIUM Struktur
7440-20-2
CAS-Nr.
7440-20-2
Bezeichnung:
Scandium
Englisch Name:
SCANDIUM
Synonyma:
SCANDIUM;SC000205;SC000200;SC000211;SC000212;SC000210;Scandium-45;Scandium lump;scandium atom;SCANDIUM METAL
CBNumber:
CB4115641
Summenformel:
Sc
Molgewicht:
44.96
MOL-Datei:
7440-20-2.mol

Scandium Eigenschaften

Schmelzpunkt:
1540 °C (lit.)
Siedepunkt:
2836 °C (lit.)
Dichte
2.99 g/mL at 25 °C (lit.)
L?slichkeit
Slowly dissolve in dilute acids.
Aggregatzustand
powder
Farbe
Silver-gray
Wichte
3
Widerstand (resistivity)
50.5 μΩ-cm, 0°C
Wasserl?slichkeit
Reacts with water.
Sensitive 
air sensitive
Merck 
13,8468
Expositionsgrenzwerte
ACGIH: TWA 2 ppm; STEL 4 ppm
OSHA: TWA 2 ppm(5 mg/m3)
NIOSH: IDLH 25 ppm; TWA 2 ppm(5 mg/m3); STEL 4 ppm(10 mg/m3)
InChIKey
SIXSYDAISGFNSX-UHFFFAOYSA-N
CAS Datenbank
7440-20-2(CAS DataBase Reference)
EPA chemische Informationen
Scandium (7440-20-2)
Sicherheit
  • Risiko- und Sicherheitserkl?rung
  • Gefahreninformationscode (GHS)
Kennzeichnung gef?hrlicher F,T,Xi
R-S?tze: 5-11-34-23/24/25-36/37/38-36/38
S-S?tze: 26-28-36/37-7/9-36/37/39-16-43-45-27
RIDADR  UN 3089 4.1/PG 2
WGK Germany  1
TSCA  Yes
HazardClass  8
PackingGroup  III
HS Code  2805304000
Bildanzeige (GHS) GHS hazard pictograms
Alarmwort Achtung
Gefahrenhinweise
Code Gefahrenhinweise Gefahrenklasse Abteilung Alarmwort Symbol P-Code
H228 Entzündbarer Feststoff. Entzündbare Feststoffe Kategorie 1 Achtung
Warnung
GHS hazard pictogramssrc="/GHS02.jpg" width="20" height="20" /> P210, P240,P241, P280, P370+P378
Sicherheit
P210 Von Hitze, hei?en Oberfl?chen, Funken, offenen Flammen und anderen Zündquellenarten fernhalten. Nicht rauchen.
P240 Beh?lter und zu befüllende Anlage erden.
P241 Explosionsgeschützte [elektrische/Lüftungs-/ Beleuchtungs-/...] Ger?te verwenden.
P280 Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.
P370+P378 Bei Brand: zum L?schen verwenden.

Scandium Chemische Eigenschaften,Einsatz,Produktion Methoden

R-S?tze Betriebsanweisung:

R5:Beim Erw?rmen explosionsf?hig.
R11:Leichtentzündlich.
R34:Verursacht Ver?tzungen.
R23/24/25:Giftig beim Einatmen, Verschlucken und Berührung mit der Haut.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.

S-S?tze Betriebsanweisung:

S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S28:Bei Berührung mit der Haut sofort abwaschen mit viel . . . (vom Hersteller anzugeben).
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
S7/9:Beh?lter dicht geschlossen an einem gut gelüfteten Ort aufbewahren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S16:Von Zündquellen fernhalten - Nicht rauchen.
S43:Zum L?schen . . . (vom Hersteller anzugeben) verwenden (wenn Wasser die Gefahr erh?ht, anfügen: "Kein Wasser verwenden").
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn m?glich, dieses Etikett vorzeigen).
S27:Beschmutzte, getr?nkte Kleidung sofort ausziehen.

Chemische Eigenschaften

grey powder

Physikalische Eigenschaften

Scandium is a soft, lightweight, silvery-white metal that does not tarnish in air, but overtime, it turns yellowish-pink. It resists corrosion. Scandium reacts vigorously with acids, butnot water. Scandium has some properties similar to the rare-earth elements. Although its position in group 3 places it at the head of the 17 elements of the lanthanide series of rare-earthmetals, scandium, as a metal, is not usually considered a rare-earth. Scandium’s melting pointis 1,541°C, its boiling point is 2836°C, and its density is 2.989 g/cm3.

Isotopes

There are 28 isotopes of scandium, ranging from scandium-36 to scandium-57.Scandium-45 is the only stable isotope and contains about 100% of the natural scandium found in the Earth’s crust. The remaining isotopes are radioactive with half-livesranging from nanoseconds to a few minutes to a few hours to a few days, and therefore,they are not found naturally in the Earth’s crust. The radioactive isotopes of scandiumare produced in nuclear reactors.

Origin of Name

From the Latin word Scandia, for “Scandinavia.

Occurrence

Although scandium is chemically similar to rare-earths, it no longer is considered to be oneof them. Scandium is the 42nd most abundant element found in the Earth’s crust, makingup about 0.0025% of the Earth’s crust. It is widely distributed at 5 ppm on the Earth. (It isabout as abundant as lithium, as listed in group 1.) Scandium is even more prevalent in thesun and several other stars than it is on Earth.Scandium is found in ores of wolframite in Norway and thortveitite in Madagascar. It isalso found in granite pegmatites and monazites. It is common in many of the ores where tinand tungsten are also found.

Charakteristisch

Scandium is the first element in the fourth period of the transition elements, which meansthat the number of protons in their nuclei increases across the period. As with all the transition elements, electrons in scandium are added to an incomplete inner shell rather than tothe outer valence shell as with most other elements. This characteristic of using electrons inan inner shell results in the number of valence electrons being similar for these transition elements although the transition elements may have different oxidation states. This is also whyall the transition elements exhibit similar chemical activity.

Verwenden

Scandium was not produced in any quantities until the late 1930s. Its light weight,resistance to corrosion, and high melting point made it especially useful in the aerospaceindustries. In the early 1940s contractors for the U.S. Air Force appropriated almost all of thescandium metal for use in the construction of military aircraft. The pure metal form is produced by the electrolysis of a salt of scandium, ScCl3. The metal has found some other uses in high-intensity lamps that produce a natural spectrum, making it useful for stadium lighting.It is also used in nickel alkaline storage batteries. Several compounds are used as catalysts tospeed up chemical reactions. The radioactive scandium-46 (with a half-life of 83.8 days) emitsbeta radiation. This property makes it useful as a radioactive tracer in the petroleum industryto monitor fractionation products.

Definition

A lightweight silvery element belonging to the first transition series. It is found in minute amounts in over 800 minerals, often associated with lanthanoids. Scandium is used in high-intensity lights and in electronic devices. Symbol: Sc; m.p. 1541°C; b.p. 2831°C; r.d. 2.989 (0°C); p.n. 21; r.a.m. 44.955910.

Hazard

As with other metals, the transition metals and many of their compounds are toxic, andtheir powdered or gaseous forms should not be ingested or inhaled. In addition, all but one ofthe isotopes of scandium are radioactive and should be handled by experienced personnel.

Scandium Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Scandium Anbieter Lieferant Produzent Hersteller Vertrieb H?ndler.

Global( 141)Lieferanten
Firmenname Telefon E-Mail Land Produktkatalog Edge Rate
Zhuoer Chemical Co., Ltd
02120970332; +8613524231522
sales@zhuoerchem.com China 2904 58
SHANGHAI KEAN TECHNOLOGY CO., LTD.
+8613817748580
cooperation@kean-chem.com China 40066 58
career henan chemical co
+86-0371-86658258 +8613203830695
sales@coreychem.com China 29880 58
Shaanxi Dideu Medichem Co. Ltd
+86-029-89586680 +86-18192503167
1026@dideu.com China 7724 58
Henan Alfa Chemical Co., Ltd

China 11865 58
Alfa Chemistry

Info@alfa-chemistry.com United States 24072 58
LEAPCHEM CO., LTD.
+86-852-30606658
market18@leapchem.com China 43340 58
Shanghai Acmec Biochemical Technology Co., Ltd.
+undefined18621343501
product@acmec-e.com China 33338 58
Aladdin Scientific
+1-+1(833)-552-7181
sales@aladdinsci.com United States 57505 58
XIAMEN AMITY INDUSTRY AND TRADE CO., LTD.
+8618950047208
ellena@amitychem.com China 43395 58

7440-20-2(Scandium)Verwandte Suche:


  • SCANDIUM SINGLE ELEMENT PLASMA STANDARD
  • SCANDIUM SINGLE ELEMENT STANDARD
  • SCANDIUM STANDARD
  • SCANDIUM PLASMA EMISSION SPECTROSCOPY STANDARD
  • SCANDIUM PLASMA EMISSION STANDARD
  • Scandium, AAS standard solution, Specpure(R), Sc 1000μg/ml
  • Scandium, plasma standard solution, Specpure(R), Sc 10,000μg/ml
  • Scandium, Oil based standard solution, Specpure(R), Sc 1000μg/g
  • Scandium foil, 0.127mm (0.005in) thick, 99.9% (REO)
  • Scandium, plasma standard solution, Specpure(R), Sc 1000μg/ml
  • Scandium nitrate solution
  • Scandium standard for AAS
  • Scandium arc-cast pellet, 15.9mm (0.63in) dia
  • Scandium,99.9+%,powder, 40 mesh
  • Scandium ingot, 99.9% (metals basis excluding Ta), Ta nominal 8-12%
  • Scandium Pieces
  • "Scandium Pieces, distilled"
  • Scandium, Lump, Vacuum Remelted 99.9%
  • SCANDIUM, PLASMA STANDARD SOLUTION
  • SCANDIUM METAL
  • SCANDIUM METALLO-ORGANIC STANDARD
  • SCANDIUM, OIL BASED STANDARD SOLUTION
  • SCANDIUM AA SINGLE ELEMENT STANDARD
  • SCANDIUM, AAS STANDARD SOLUTION
  • SCANDIUM
  • SCANDIUM ATOMIC ABSORPTION STANDARD
  • SCANDIUM ATOMIC ABSORPTION STANDARD SOLUTION
  • SCANDIUM ATOMIC SPECTROSCOPY STANDARD
  • SCANDIUM ICP STANDARD
  • Scandium lump
  • Scandium powder
  • ScandiumlumpvacuumremeltedN
  • ScandiumpowderNREOampouledunderargon
  • SCANDIUM, POWDER, 99.9%
  • SCANDIUM, DISTILLED DENDRITIC PIECES, 99 .9%
  • SCANDIUM, CHIP, 99.9%
  • SCANDIUM LUMP, VACUUM REMELTED (99.9% REO)
  • SCANDIUM POWDER (99.9% REO)
  • SCANDIUM FOIL, 0.25MM (0.01IN) THICK, 99.9% (REO)
  • SCANDIUM ROD 6.35MM (0.25IN) DIA 99.9% (METALS BASIS EXCLUDING TA)
  • SCANDIUM FOIL, 0.025MM (0.001IN) THICK, 99.9% (REO)
  • SCANDIUM ROD, 12.7MM (0.5IN) DIA, 99.9% (METALS BASIS EXCLUD
  • foil,0.127mm=0.005inthick
  • Scandium, powder, 40 mesh, 99.9+%
  • SCANDIUM: 99.9%, POWDER, -420 MICRON, AMPOULED UNDER ARGON
  • SCANDIUM LUMP, VACUUM REMELTED, 3N: (99.9% REO)
  • SCANDIUM: 99.5%, INGOT, AMPOULED UNDER ARGON
  • Scandium, Lump, Vacuum Remelted
  • Scandium-45
  • SC000205
  • SC000200
  • SC000211
  • SC000212
  • SC000210
  • ScandiuM rod, 12.7MM (0.5in) dia, 99.6% (Metals basis excluding Ta)
  • Scandium powder, 99.9% trace rare earth metals basis
  • YSG BROTH TUBE
  • Scandium pieces, distilled dendritic, 99.9% trace rare earth metals basis
Copyright 2019 ? ChemicalBook. All rights reserved