يوروپيوم (په انگرېزي : Europium ) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Eu سمبول او ۶۳ اتمي شمېرې په وسیله ښودل شوی دی.
Europium, 63 Eu Pronunciation / j ʊ ˈ r oʊ p i ə m / ew-ROH -pee-əm Appearance silvery white, with a pale yellow tint;[۱] but rarely seen without oxide discoloration اټومي شمیره (Z ) 63 گروپ , پیریود group n/a , period 6 بلاک f-block Element category lanthanide معياري اټومي وزن (A r ) کينډۍ:Val [۲] Electron configuration [Xe ] 4f7 6s2 Electrons per shell
2, 8, 18, 25, 8, 2 حالت (at STP ) جامد دويلې کيدو ټکى 1099 K (826 °C, 1519 °F) يشنا ټکی 1802 K (1529 °C, 2784 °F) Density near r.t. 5.264 g/cm3 when liquid, at m.p. 5.13 g/cm3 Heat of fusion 9.21 kJ/mol Heat of vaporization 176 kJ/mol Molar heat capacity 27.66 J/(mol·K) Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
863
957
1072
1234
1452
1796
Oxidation states 3 , 2 , 1 (a mildly basic oxide)Electronegativity Pauling scale: 1.2 Ionization energies 1st: 547.1 kJ/mol 2nd: 1085 kJ/mol 3rd: 2404 kJ/mol Atomic radius empirical: 180 pm Covalent radius 198±6 pm Crystal structure body-centered cubic (bcc)Body-centered cubic crystal structure for europium Thermal expansion poly: 35.0 µm/(m·K) (at r.t. ) د تودوخې تېرېدنه est. 13.9 W/(m·K) Electrical resistivity poly: 0.900 µΩ·m (at r.t. ) Magnetic ordering paramagnetic [۳] Magnetic susceptibility (χ mol ) +34,000.0·10−6 cm3 /mol[۴] Young's modulus 18.2 GPa Shear modulus 7.9 GPa Bulk modulus 8.3 GPa Poisson ratio 0.152 Vickers hardness 165–200 MPa CAS Number 7440-53-1 Naming after Europe Discovery and first isolationEugène-Anatole Demarçay (1896, 1901)
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