خصائص

CAS Number7440-45-1
PubChem CID23974
نصف قطر ذري١٨٢
الحجم الذري٢٠٫٦٧
الكتلة الذرية١٤٠٫١١٦
المستوى الفرعيf
نقطة الغليان٣٬٤٤٣
Bulk Modulus
الفئةاللانثينيدات
البنية البلوريةسداسي بسيط
اللونفضة
نصف قطر تساهمي٢٠٤
كثافة٦٫٧٧
Electrical Resistivity
توزيع إلكتروني[Xe] 4f1 5d1 6s2
توزيع الإلكترونات لكل غلاف تكافؤ2, 8, 18, 19, 9, 2
الكهرسلبية١٫١٢
Electrons58
المجموعةna
حرارة الانصهار٥٫٥
حرارة التبخر٣٥٠
جهد التأين٥٫٥٣٩
Magnetic Ordering
Magnetic Susceptibility
كتلة١٤٠٫١١٦
Mass Number58
نقطة الانصهار٧٩٥
الاسمسيريوم
النيوترونات82
عدد ذري140
أرقام الأكسدة2, 3, 4
الدوري6
الطورصلب
Poisson Ratio
البروتونات58
Shear Modulus
السعة الحرارية٠٫١٩٢
الرمزCe
الناقلية الحرارية٠٫١١٤
Van der Waals radius
Young's Modulus
الوفرة
متوفر في قشرة الأرض0.006%
متوفر بشكل عام1×10-6%
Ce سيريوم 58 140.116 6 f 58 798.0 3257.0 [Xe] 4f1 5d1 6s2 2 8 18 19 9 2 6.66 0.006% Silver Cubic: Face centered 1.1 {"1":"534.4","2":"1050","3":"1949","4":"3547","5":"6325","6":"7490"} 534 50 +3,4 1.81 21.0 9.2 313.8 0.19 11.4 12.5K 0 Solid, Paramagnetic, Conductor, Lanthanide, Stable, Natural SER-i-em Malleable, ductile, iron-gray metal. Its oxides are used in the optics and glass-making industries. Its salts are used in the photography and textile industry. Used in high-intensity carbon lamps and as alloying agents in special metals. Most abundant rare earth metal. Found in many minerals like monazite sand [Ce(PO4)]. frD3126ry8o Cerium
Rhodium was discovered in 1803 by William Hyde Wollaston in London.

He used crude platinum ore presumably obtained from South America.

The introduction of the three way catalytic converter by Volvo in 1976 increased the demand for rhodium. From the Greek word rhodon, rose 58 1803 Wilhelm von Hisinger, Jöns Jacob Berzelius, Martin Klaproth Sweden, Germany Named after the asteroid Ceres which discovered in 1801, 2 years before the element

Isotopes of Rhodium

Standard Atomic Weight

140.116(1)

النظائر المستقرة

136Ce 138Ce 140Ce 142Ce

النظائرغير المستقرة

119Ce 120Ce 121Ce 122Ce 123Ce 124Ce 125Ce 126Ce 127Ce 128Ce 129Ce 130Ce 131Ce 132Ce 133Ce 134Ce 135Ce 137Ce 139Ce 141Ce 143Ce 144Ce 145Ce 146Ce 147Ce 148Ce 149Ce 150Ce 151Ce 152Ce 153Ce 154Ce 155Ce 156Ce 157Ce

Rhodium is considered to be non-toxic
Rhodium metal does not normally form an oxide, even when heated
The element's major use is as one of the catalysts in the three-way catalytic converters in automobiles.

Rhodium is used as an alloying agent for hardening and improving the corrosion resistance of platinum and palladium.

It is also used as a filter in mammography systems because of the characteristic X-rays it produces.

Rhodium is also used for jewelry and for decorations.