แม่แบบ:กล่องข้อมูล ฮีเลียม
ฮีเลียม | |||||||||||||||||||||
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Pronunciation | /ˈhiːliəm/ | ||||||||||||||||||||
Appearance | เป็นแก๊สไม่มีสี มันจะเรืองแสงสีส้มแดงขณะที่อยู่ในสนามไฟฟ้าแรงดันสูง | ||||||||||||||||||||
Standard atomic weight Ar°(He) | |||||||||||||||||||||
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ฮีเลียม in the periodic table | |||||||||||||||||||||
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Group | group 18 (noble gases) | ||||||||||||||||||||
Period | period 1 | ||||||||||||||||||||
Block | s-block | ||||||||||||||||||||
Electron configuration | 1s2 | ||||||||||||||||||||
Electrons per shell | 2 | ||||||||||||||||||||
Physical properties | |||||||||||||||||||||
Phase at STP | แก๊ส | ||||||||||||||||||||
Melting point | (at 2.5 MPa) 0.95 K (−272.20 °C, −457.96 °F) | ||||||||||||||||||||
Boiling point | 4.222 K (−268.928 °C, −452.070 °F) | ||||||||||||||||||||
Density (at STP) | 0.1786 g/L | ||||||||||||||||||||
when liquid (at m.p.) | 0.145 g/cm3 | ||||||||||||||||||||
when liquid (at b.p.) | 0.125 g/cm3 | ||||||||||||||||||||
Triple point | 2.177 K, 5.043 kPa | ||||||||||||||||||||
Critical point | 5.1953 K, 0.22746 MPa | ||||||||||||||||||||
Heat of fusion | 0.0138 kJ/mol | ||||||||||||||||||||
Heat of vaporization | 0.0829 kJ/mol | ||||||||||||||||||||
Molar heat capacity | 5R/2 = 20.78[2] J/(mol·K) | ||||||||||||||||||||
Vapor pressure (defined by ITS-90)
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Atomic properties | |||||||||||||||||||||
Oxidation states | 0 | ||||||||||||||||||||
Electronegativity | Pauling scale: ไม่มีข้อมูล | ||||||||||||||||||||
Covalent radius | 28 pm | ||||||||||||||||||||
Van der Waals radius | 140 pm | ||||||||||||||||||||
Spectral lines of ฮีเลียม | |||||||||||||||||||||
Other properties | |||||||||||||||||||||
Natural occurrence | primordial | ||||||||||||||||||||
Crystal structure | เฮกซะโกนัลปิดบรรจุ | ||||||||||||||||||||
Speed of sound | 972 m/s | ||||||||||||||||||||
Thermal conductivity | 0.1513 W/(m⋅K) | ||||||||||||||||||||
Magnetic ordering | ไดอะแมกเนติก[3] | ||||||||||||||||||||
CAS Number | 7440-59-7 | ||||||||||||||||||||
History | |||||||||||||||||||||
Discovery | ปิแอร์ แจนส์เซน, นอร์แมน ล็อกเยอร์ (1868) | ||||||||||||||||||||
First isolation | วิลเลียม แรมเซย์, เพอร์ ทีโอดอร์ คลีฟ, อับราฮัม แลงเล็ต (1895) | ||||||||||||||||||||
Isotopes of ฮีเลียม | |||||||||||||||||||||
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อ้างอิง
- ↑ "Standard Atomic Weights: Helium". CIAAW. 1983.
- ↑ Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383. doi:10.1002/0471238961.0701190508230114.a01.
- ↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
- ↑ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
- ↑ Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights