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Hoi, 2 He ngoi-kôn
colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field Spectral lines of helium Kî-pún sin-sit Miàng, fù-ho
Hoi, He Yîn-ngî
helium ngoi-hìn
colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field Hoi chhai chû-khì-péu ke vi-chi
ngièn-chṳ́ sì-sú
2 ngièn-chṳ́-liòng (±)
4.002602(2)[ 1] ngièn-su lui-phe̍t
hî-yù hi-thí Chhu̍k , fûn-khî
18 chhu̍k , s-block chû-khì
period 1 thien-chṳ́ phài-lie̍t
1s2 per shell
2 vu̍t-lî sin-chṳt Siông
hi-thí yùng-tiám
0.95 K (−272.20 °C, −457.96 °F) (at 2.5 MPa) pui-tiám
4.222 K (−268.928 °C, −452.070 °F) me̍t-thu at stp (0 °C and 101.325 kPa )
0.1786 g·L−1
0.145 g·cm−3
0.125 g·cm−3 Sâm-siong-tiám
2.177 K, 5.043 kPa lìm-kie-tiám
5.1953 K, 0.22746 MPa Yùng-fa-ngie̍t
0.0138 kJ·mol−1 Chîn-fat-ngie̍t
0.0829 kJ·mol−1 Ngie̍t-yùng-liong
20.78[ 2] J·mol−1 ·K−1
chîn-hi-ap (defined by ITS-90 )
P (Pa)
1
10
100
1 k
10 k
100 k
chhai T (K)
1.23
1.67
2.48
4.21
Ngièn-chṳ́ sin-chṳt Yông-fa-su
0 Thien-fu-sin
Pauling scale: no data Thien-lì-nèn
1st: 2372.3 kJ·mol−1 2nd: 5250.5 kJ·mol−1 Khiung-ka pan-kang
28 pm Van der Waals pan-kang
140 pm Miscellanea Chîn-thí keu-chho
hexagonal close-packed (hcp) Sâng-suk
972 m·s−1 Ngie̍t-chhòn-thô-li̍t
0.1513 W·m−1 ·K−1 Chhṳ̀-sin
diamagnetic [ 3] CAS Registry Number
7440-59-7 Le̍k-sú Hí-miàng
after Helios , Greek god of the Sun Fat-hien
Pierre Janssen , Norman Lockyer (1868) First isolation
William Ramsay , Per Teodor Cleve , Abraham Langlet (1895) Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Hoi ke thùng-vi-su
* Atmospheric value, abundance may differ elsewhere
Hoi
Hoi (氦) , fe̍t-chá ham-cho Yòng (氜), he yit-tsúng Fa-ho̍k Ngièn-su , fa-ho̍k fù-ho vì He , ngièn-tsṳ́ su-muk he 2 .
Chhâm-kháu chṳ̂-liau