hydrogen

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English

Chemical element
H Next: helium (He)

Etymology

From French hydrogène, coined by Louis-Bernard Guyton de Morveau, from Ancient Greek ὕδωρ (húdōr, “water”) + γεννάω (gennáō, “I bring forth”). Corresponding to hydro- +‎ -gen.

Pronunciation

Noun

hydrogen (countable and uncountable, plural hydrogens)

  2. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794.
    1. An atom of the element.
  3. Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature.
    1. A molecule of this molecular species
  4. The isotope hydrogen-1 (also symbol H), contrasting with deuterium and tritium
    Synonym: protium
    • Hydrogen is generally considered to be electronically the same as deuterium. In both PdHx and PdDx a resistivity maximum is found near 50 K.
  5. A sample of the element/molecule.

Synonyms

element
molecule

Hyponyms

isotopes
molecule

Derived terms

Related terms

Descendants

Translations

See also

Periodic table of elements in English · periodic table of elements (layout · text)
Period
Group
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 1
H 		Color of the number (state of matter at STP): liquid, gas, solid, solid (synthetic), not yet been discovered 2
He
2 3
Li 		4
Be 		Blocks: d-block f-block p-block s-block 5
B 		6
C 		7
N 		8
O 		9
F 		10
Ne
3 11
Na 		12
Mg 		13
Al 		14
Si 		15
P 		16
S 		17
Cl 		18
Ar
4 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
5 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
6 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
7 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

* lanthanides 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
** actinides 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

References

Further reading

Danish

Noun

hydrogen n (singular definite hydrogenet, not used in plural form)

  1. hydrogen
    Synonym: brint

Norwegian Bokmål

Chemical element
H Next: helium (He)
Norwegian Wikipedia has an article on:
Wikipedia no

Noun

hydrogen n (definite singular hydrogenet) (uncountable)

  1. hydrogen (chemical element, symbol H)

Derived terms

Norwegian Nynorsk

Chemical element
H Next: helium (He)
Norwegian Nynorsk Wikipedia has an article on:
Wikipedia nn

Noun

hydrogen n (definite singular hydrogenet) (uncountable)

  1. hydrogen (chemical element, symbol H)

Derived terms

Welsh

Chemical element
H Next: heliwm (He)
Welsh Wikipedia has an article on:
Wikipedia cy

Etymology

Borrowed from English hydrogen, from French hydrogène, from Ancient Greek ὕδωρ (húdōr, “water”) + γεννάω (gennáō, “I bring forth”).

Pronunciation

Noun

hydrogen m (uncountable, not mutable)

  1. hydrogen
    Synonyms: ulai, ulnwy

Derived terms

Further reading

  • R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “hydrogen”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies
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