ngoi-kôn silvery gray metallic; corrodes to aspalling black oxide coat in air Kî-pún sin-sit Miàng,fù-ho Uranium, U ngoi-hìn silvery gray metallic; corrodes to aspalling black oxide coat in air Uranium chhaichû-khì-péu ke vi-chi ngièn-chṳ́ sì-sú 92 ngièn-chṳ́-liòng (±) 238.02891(3)[ 1] ngièn-su lui-phe̍t actinium-hi Chhu̍k ,fûn-khî n/a , f-block chû-khì period 7 thien-chṳ́ phài-lie̍t [Rn ] 5f3 6d1 7s2 per shell 2, 8, 18, 32, 21, 9, 2 vu̍t-lî sin-chṳt Siông ku-thí yùng-tiám 1405.3 K (1132.2 °C, 2070 °F) pui-tiám 4404 K (4131 °C, 7468 °F) Me̍t-thu near Sit-vûn 19.1 g·cm−3 17.3 g·cm−3 Yùng-fa-ngie̍t 9.14 kJ·mol−1 Chîn-fat-ngie̍t 417.1 kJ·mol−1 Ngie̍t-yùng-liong 27.665 J·mol−1 −1 chîn-hi-ap P (Pa) 1 10 100 1 k 10 k 100 k chhai T (K) 2325 2564 2859 3234 3727 4402
Ngièn-chṳ́ sin-chṳt Yông-fa-su 6 , 5, 4, 3,[ 2] basic oxide)Thien-fu-sin Pauling scale: 1.38 Thien-lì-nèn 1st: 597.6 kJ·mol−1 −1 Ngièn-chṳ́ pan-kang empirical: 156 pm Khiung-ka pan-kang 196±7 pm Van der Waals pan-kang 186 pm Miscellanea Chîn-thí keu-chho orthorhombic Sâng-suk thin rod 3155 m·s−1 Ngie̍t-phàng-chong 13.9 µm·m−1 −1 Ngie̍t-chhòn-thô-li̍t 27.5 W·m−1 −1 Thien-chú-li̍t 0.280 µΩ·m (at 0 °C) Chhṳ̀-sin paramagnetic Young's modulus 208 GPa Shear modulus 111 GPa Bulk modulus 100 GPa Poisson ratio 0.23 Vickers hardness 1960–2500 MPa Brinell hardness 2350–3850 MPa CAS Registry Number 7440-61-1 Le̍k-sú Hí-miàng after planetUranus , itself named after Greek god of the skyUranus Fat-hien Martin Heinrich Klaproth (1789) First isolation Eugène-Melchior Péligot (1841) Chui vún-thin ke thùng-vi-su Chú vùn-chông:Uranium ke thùng-vi-su 
