Kap

Kap,  ₁₉K

ngoi-kôn
silvery gray Spectral lines of potassium
Kî-pún sin-sit
Miàng, fù-ho	Kap, K
Yîn-ngî	potassium
ngoi-hìn	silvery gray
Kap chhai chû-khì-péu ke vi-chi
Na ↑ K ↓ Rb argon ← Kap → Koi
ngièn-chṳ́ sì-sú	19
ngièn-chṳ́-liòng (±)	39.0983(1)
ngièn-su lui-phe̍t	kán-kîm-su̍k
Chhu̍k, fûn-khî	1 chhu̍k, s-block
chû-khì	period 4
thien-chṳ́ phài-lie̍t	[Ar] 4s1
per shell	2, 8, 8, 1
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	336.7 K ​(63.5 °C, ​146.3 °F)
pui-tiám	1032 K ​(759 °C, ​1398 °F)
Me̍t-thu near Sit-vûn	0.862 g·cm−3
0.828 g·cm−3
lìm-kie-tiám	2223 K, 16 MPa
Yùng-fa-ngie̍t	2.33 kJ·mol−1
Chîn-fat-ngie̍t	76.9 kJ·mol−1
Ngie̍t-yùng-liong	29.6 J·mol−1·K−1
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	1, −1 ​(a strongly basic oxide)
Thien-fu-sin	Pauling scale: 0.82
Thien-lì-nèn	1st: 418.8 kJ·mol−1 2nd: 3052 kJ·mol−1 3rd: 4420 kJ·mol−1 (more)
Ngièn-chṳ́ pan-kang	empirical: 227 pm
Khiung-ka pan-kang	203±12 pm
Van der Waals pan-kang	275 pm
Miscellanea
Chîn-thí keu-chho	​body-centered cubic (bcc)
Sâng-suk thin rod	2000 m·s−1 (at 20 °C)
Ngie̍t-phàng-chong	83.3 µm·m−1·K−1 (at 25 °C)
Ngie̍t-chhòn-thô-li̍t	102.5 W·m−1·K−1
Thien-chú-li̍t	72 nΩ·m (at 20 °C)
Chhṳ̀-sin	paramagnetic
Young's modulus	3.53 GPa
Shear modulus	1.3 GPa
Bulk modulus	3.1 GPa
Mohs hardness	0.4
Brinell hardness	0.363 MPa
CAS Registry Number	7440-09-7
Le̍k-sú
Hoat-kiàn kap siōng chá ê tông-ūi-sò͘	Humphry Davy (1807)
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Kap ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 39K 93.26% 39K is stable with 20 neutrons 40K 0.012% 1.248(3)×109 y β− 40Ca ε 40Ar β 40Ar 41K 6.73% 41K is stable with 22 neutrons

Kap (鉀) he yit-chúng Fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì K, ngièn-chṳ́ su-muk he 19, chhai Ngièn-su chû-khì-péu chûng thi-sṳ̍p-kiú vi.