Hydrogen Element (Periodic Table)

Hydrogen

Hydrogen (H) is a chemical element of the periodic table, located in the group 1 and the period 1, and is having the atomic number 1. It is a colorless, odorless, tasteless, highly combustible gas, whose name comes from the Greek word “hydro” and “genes”, which means water forming. It is a reactive nonmetal. It is the lightest element and is the tenth most abundant element on earth.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
1
H
2
He
2
3
Li
4
Be
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
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
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
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
71
Lu
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
103
Lr
– s block

FAQs on Hydrogen Element

Hydrogen
‣ What does hydrogen look like?

Appearance: colorless gas
‣ Who discovered hydrogen? When was hydrogen discovered?

Discovery: Henry Cavendish (1766)
Named by: Antoine Lavoisier (1783)
‣ Where is hydrogen located on the periodic table?

Hydrogen Periodic Table

Location: Hydrogen is found in the first column of the periodic table above the lithium element.
‣ What is hydrogen’s atomic number?

Atomic number (Z): 1
‣ What is hydrogen symbol?

Symbol: H
‣ What is hydrogen’s atomic weight?

Standard atomic weight: [1.00784, 1.00811] conventional: 1.008
‣ What block is hydrogen in the periodic table?

Block: s-block
‣ What group does hydrogen belong to?

Group: 1 (hydrogen and alkali metals)
‣ What is hydrogen’s period number?

Period: 1
‣ What is the covalent radius of hydrogen?

Covalent radius: 31±5 pm
Hydrogen Van der Waals radius: 120 pm
‣ What is hydrogen melting point?

Melting point: (H2) 13.99 K (-259.16 °C, -434.49 °F)
‣ What is hydrogen’s boiling point?

Boiling point: (H2) 20.271 K (-252.879 °C, -423.182 °F)
Hydrogen critical point: 32.938 K, 1.2858 MPa
Hydrogen triple point: 13.8033 K, 7.041 kPa
‣ How many electron shells does hydrogen have?

Electrons per shell: 1
‣ What is the ground state electron configuration for hydrogen?

Electron configuration: 1s1
‣ What is hydrogen ionization energy?

Ionization energies:1st: 1312.0 kJ/mol
‣ What phase of matter is hydrogen at room temperature?

Phase (at r.t): gas
‣ What is hydrogen density?

Density (at STP): 0.08988 g/L
when liquid (at m.p): 0.07 g/cm3 (solid: 0.0763 g/cm3)
when liquid (at b.p): 0.07099 g/cm3
Hydrogen magnetic ordering: diamagnetic
Hydrogen natural occurrence: primordial
‣ What is the oxidation state of hydrogen?

Oxidation state: +1
‣ What is the electronegativity value of hydrogen?

Electronegativity: Pauling scale: 2.20
Hydrogen heat of fusion: (H2) 0.117 kJ/mol
Hydrogen heat of vaporization: (H2) 0.904 kJ/mol
Hydrogen molar heat capacity: (H2) 28.836 J/(mol K)
Hydrogen molar magnetic susceptibility: -3.98 × 10-6 cm3/mol (298 K)
Speed of sound in hydrogen: 1310 m/s (gas, 27 °C)
‣ What is the crystal structure of hydrogen?

Crystal structure: hexagonal
Thermal conductivity of hydrogen: 0.1805 W/(m.K)
Hydrogen CAS number:
12385-13-6
1333-74-0 (H2)

‣ Hydrogen vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)1520

‣ How many hydrogen isotopes are there?

Main isotopes of hydrogen
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
1H99.98 %stable
2H0.02 %stable
3Htrace12.32 yβ3He

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