Europium, 63 Eu ngoi-kôn
silvery white, with a pale yellow tint;[ 1] but rarely seen without oxide discoloration Kî-pún sin-sit Miàng, fù-ho
Europium, Eu ngoi-hìn
silvery white, with a pale yellow tint;[ 1] but rarely seen without oxide discoloration Europium chhai chû-khì-péu ke vi-chi
ngièn-chṳ́ sì-sú
63 ngièn-chṳ́-liòng (±)
151.964(1)[ 2] ngièn-su lui-phe̍t
lanthanum-hi Chhu̍k , fûn-khî
n/a , f-block chû-khì
period 6 thien-chṳ́ phài-lie̍t
[Xe ] 4f7 6s2 per shell
2, 8, 18, 25, 8, 2 vu̍t-lî sin-chṳt Siông
ku-thí yùng-tiám
1099 K (826 °C, 1519 °F) pui-tiám
1802 K (1529 °C, 2784 °F) Me̍t-thu near Sit-vûn
5.264 g·cm−3
5.13 g·cm−3 Yùng-fa-ngie̍t
9.21 kJ·mol−1 Chîn-fat-ngie̍t
176 kJ·mol−1 Ngie̍t-yùng-liong
27.66 J·mol−1 ·K−1
chîn-hi-ap
P (Pa)
1
10
100
1 k
10 k
100 k
chhai T (K)
863
957
1072
1234
1452
1796
Ngièn-chṳ́ sin-chṳt Yông-fa-su
3 , 2 , 1 (a mildly basic oxide) Thien-fu-sin
Pauling scale: 1.2 Thien-lì-nèn
1st: 547.1 kJ·mol−1 2nd: 1085 kJ·mol−1 3rd: 2404 kJ·mol−1 Ngièn-chṳ́ pan-kang
empirical: 180 pm Khiung-ka pan-kang
198±6 pm Miscellanea Chîn-thí keu-chho
body-centered cubic (bcc) Ngie̍t-phàng-chong
poly: 35.0 µm·m−1 ·K−1 (at r.t. ) Ngie̍t-chhòn-thô-li̍t
est. 13.9 W·m−1 ·K−1 Thien-chú-li̍t
poly: 0.900 µΩ·m (at r.t. ) Chhṳ̀-sin
paramagnetic [ 3] 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 Registry Number
7440-53-1 Le̍k-sú Hí-miàng
after Europe Hoat-kiàn kap siōng chá ê tông-ūi-sò͘
Eugène-Anatole Demarçay (1896, 1901) Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Europium ke thùng-vi-su
iso
NA
half-life
DM
DE (MeV )
DP
150 Eu
syn
36.9 y
ε
2.261
150 Sm
151 Eu
47.8%
5×1018 y
α
1.9644
147 Pm
152 Eu
syn
13.54 y
ε
1.874
152 Sm
β−
1.819
152 Gd
153 Eu
52.2%
–
(α)
0.2736
149 Pm
154 Eu
syn
8.59 y
β−
1.969
154 Gd
155 Eu
syn
4.76 y
β−
0.253
155 Gd
Decay modes in parentheses are predicted, but have not yet been observed
Europium (Hon-ngî : 銪 yǒu ) he yit-chúng fa-ho̍k ngièn-su , fa-ho̍k fù-ho vì Eu , ngièn-chṳ́ su-muk he 63 .