Ang oksihena o oxigeno (Iningles oxygen ) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga O ug kaiphan nga atomik 8. Ang oksihena mao ang wala puthaw . Ang purong oxygen makaplagan sa kinaiyahan kasagaran isip O2 o nagtapon nga duha ka atom sa oxygen.
Quick Facts Oxygen, Panagway ...
Oxygen
8
Panagway
colorless gas; pale blue liquid. Oxygen bubbles rise in this photo of liquid oxygen .
Kinatibuk-ang mga kinaiya
Ngalan, simbolo , kaiphan
oxygen, O, 8
Paglitok
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all
Kategoriyang elemento wala puthaw , chalcogen
Group , period , block 16 , 2 , p
Gibug-aton sa atomo 15.999(4)
Kontorno sa elektron [He] 2s2 2p4 Electron shells of oxygen (2, 6)
History
Pagkadiskobre Carl Wilhelm Scheele (1772)
Named by
Antoine Lavoisier (1777)
Physical properties
Phase gas
Density (0 °C, 101.325 kPa )
Liquid density at b.p.
1.141 g·cm−3
Melting point 54.36 K , -218.79 °C, -361.82 °F
Boiling point 90.20 K, -182.95 °C, -297.31 °F
Critical point 154.59 K, 5.043 MPa
Heat of fusion (O2 ) 0.444 kJ·mol−1
Heat of vaporization (O2 ) 6.82 kJ·mol−1
Molar heat capacity (O2 )−1 ·K−1
Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
61
73
90
Atomic properties
Oxidation states 2 , 1 , − 1− 2
Electronegativity 3.44 (Pauling scale)
Ionization energies more )1st: 1313.9 kJ·mol−1
2nd: 3388.3 kJ·mol−1
3rd: 5300.5 kJ·mol−1
Covalent radius 66±2 pm
Van der Waals radius 152 pm
Miscellanea
Crystal structure cubic
Magnetic ordering paramagnetic
Thermal conductivity 26.58x10-3 W·m−1 ·K−1
Speed of sound (gas, 27 °C) 330 m·s−1
CAS registry number 7782-44-7
Most stable isotopes
Main article: Isotopes of oxygen
iso NA half-life DM DE (MeV ) DP
16 O 99.76%
16 O is stable with 8 neutrons
17 O 0.039%
17 O is stable with 9 neutrons
18 O 0.201%
18 O is stable with 10 neutrons
· r
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