Oksigèn

Oksigèn utawa zat asem iku unsur kimia sajeroning sistem tabel périodik kang duwé lambang O lan nomer atom 8. Elemèn biyasa lan ana ing endi-endi, tinemu ora mung ing Bumi nanging ing saindhenging alam semesta. Ing Bumi, oksigèn lumrahé gegandhèngan karo unsur liya kanthi kovalen utawa ionik.

Oksigèn ora kaiket (uga ingaran molekul oksigèn, utawa dioksigen, O₂, molekul diatomik) pisanan muncul sajeroning cacah kang signifikan ing Bumi sajeroning era Paleoproterozoik (antara 2,5 milyar taun lan 1,6 milyar taun kapungkur) minangka produk saka aktivitas metabolik déning organisme anaerob wiwitan (archaea lan baktèri). Akèhé oksigèn bébas ing atmosfer ing epoch géologi sabanjuré lan paningkatan konsentrasiné nganti tingkat wektu iki mligi disebabaké sintesis saka organisme fotosintetik; watara telungprapat dikasilaké déning alga lan mikroorganisme ijo ing sagara, lan seprapat manèh déning tuwuhan ing dharatan.

Karakteristik

Oksigèn iku siji saka loro komponèn utama udara. Oksigèn dikasilaké déning tuwuhan sajeroning prosès fotosintesis, lan diperlokaké banget kanggo pernafasan aerobik kéwan lan manungsa. Tembung oksigèn dijupuk saka loro tembung basa Yunani, οξυς (oxys) (asem, landhep) lan -γενης (-genēs) (dilairaké). Ing wiwitan abad ka-18, Antoine Lavoisier migunakaké jeneng oksigèn saka akar basa Yunani amarga dhèwèké percaya yèn iku komponèn saka kabèh asem (dhéfinisi asem mau wektu iki wis direvisi).

Golongan →

Période ↓

1
H

2
He

3
Li

4
Be

5
B

6
C

7
N

8
O

9
F

10
Ne

11
Na

12
Mg

13
Al

14
Si

15
P

16
S

17
Cl

18
Ar

19
K

20
Ca

21
Sc

22
Ti

23
V

24
Cr

25
Mn

26
Fe

27
Co

28
Ni

29
Cu

30
Zn

31
Ga

32
Ge

33
As

34
Se

35
Br

36
Kr

37
Rb

38
Sr

39
Y

40
Zr

41
Nb

42
Mo

43
Tc

44
Ru

45
Rh

46
Pd

47
Ag

48
Cd

49
In

50
Sn

51
Sb

52
Te

53
I

54
Xe

55
Cs

56
Ba

71
Lu

72
Hf

73
Ta

74
W

75
Re

76
Os

77
Ir

78
Pt

79
Au

80
Hg

81
Tl

82
Pb

83
Bi

84
Po

85
At

86
Rn

87
Fr

88
Ra

103
Lr

104
Rf

105
Db

106
Sg

107
Bh

108
Hs

109
Mt

110
Ds

111
Rg

112
Cn

113
Nh

114
Fl

115
Mc

116
Lv

117
Ts

118
Og

* Lantanida

57
La

58
Ce

59
Pr

60
Nd

61
Pm

62
Sm

63
Eu

64
Gd

65
Tb

66
Dy

67
Ho

68
Er

69
Tm

70
Yb

** Aktinida

89
Ac

90
Th

91
Pa

92
U

93
Np

94
Pu

95
Am

96
Cm

97
Bk

98
Cf

99
Es

100
Fm

101
Md

102
No

Seri Kimia saka Tabel Périodik
Logam alkali	Alkali tanah	Lantanida	Aktinida	Logam transisi
Logam	Metaloid	Nonlogam	Halogen	Gas mulia

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