Koi, 20 Ca ngoi-kôn
dull gray, silver; with a pale yellow tint[1] Spectral line s of calcium Kî-pún sin-sit Miàng, fù-ho
Koi, Ca Yîn-ngî
calcium ngoi-hìn
dull gray, silver; with a pale yellow tint[1] Koi chhai chû-khì-péu ke vi-chi
ngièn-chṳ́ sì-sú
20 ngièn-chṳ́-liòng (±)
40.078(4)[2] ngièn-su lui-phe̍t
kán-thú kîm-su̍k Chhu̍k , fûn-khî
2 chhu̍k , s-block chû-khì
period 4 thien-chṳ́ phài-lie̍t
[Ar ] 4s2 per shell
2, 8, 8, 2 vu̍t-lî sin-chṳt Siông
ku-thí yùng-tiám
1115 K (842 °C, 1548 °F) pui-tiám
1757 K (1484 °C, 2703 °F) Me̍t-thu near Sit-vûn
1.55 g·cm−3
1.378 g·cm−3 Yùng-fa-ngie̍t
8.54 kJ·mol−1 Chîn-fat-ngie̍t
154.7 kJ·mol−1 Ngie̍t-yùng-liong
25.929 J·mol−1 ·K−1
chîn-hi-ap
P (Pa)
1
10
100
1 k
10 k
100 k
chhai T (K)
864
956
1071
1227
1443
1755
Ngièn-chṳ́ sin-chṳt Yông-fa-su
+2 , +1, −1[3] (a strongly basic oxide) Thien-fu-sin
Pauling scale: 1.00 Thien-lì-nèn
1st: 589.8 kJ·mol−1 2nd: 1145.4 kJ·mol−1 3rd: 4912.4 kJ·mol−1 (more ) Ngièn-chṳ́ pan-kang
empirical: 197 pm Khiung-ka pan-kang
176±10 pm Van der Waals pan-kang
231 pm Miscellanea Chîn-thí keu-chho
face-centered cubic (fcc) Sâng-suk thin rod
3810 m·s−1 (at 20 °C) Ngie̍t-phàng-chong
22.3 µm·m−1 ·K−1 (at 25 °C) Ngie̍t-chhòn-thô-li̍t
201 W·m−1 ·K−1 Thien-chú-li̍t
33.6 nΩ·m (at 20 °C) Chhṳ̀-sin
diamagnetic Young's modulus
20 GPa Shear modulus
7.4 GPa Bulk modulus
17 GPa Poisson ratio
0.31 Mohs hardness
1.75 Brinell hardness
170–416 MPa CAS Registry Number
7440-70-2 Le̍k-sú Hoat-kiàn kap siōng chá ê tông-ūi-sò͘
Humphry Davy (1808) Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Koi ke thùng-vi-su
Decay modes in parentheses are predicted, but have not yet been observed
Koi (鈣) he yit-chúng fa-ho̍k ngièn-su , fa-ho̍k fù-ho vì Ca , ngièn-chṳ́ su-muk he 20 , chhai Ngièn-su chû-khì-péu chûng thi-ngi-sṳ̍p vi.