Barium Element (Periodic Table)

Barium

Barium (Ba) is a chemical element of the periodic table, located in the group 2 and the period 6, and has the atomic number 56. It is a soft, silvery-white alkaline earth metal, whose name comes from the Greek word “barys”, which means heavy. It is a highly reactive metal that is not available freely in nature.

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 Barium Element

Barium
‣ What does barium look like?

Appearance: silvery grey; with a pale yellow tint
‣ Who discovered barium and when?

Discovery: Carl Wilhelm Scheele (1772)
First isolation: Humphry Davy (1808)
‣ Where is barium on the periodic table?

Barium Periodic Table

Location: Barium is found in the second column of the periodic table, next to the caesium element.
‣ What’s the atomic number of barium?

Atomic number (Z): 56
‣ What is barium’s symbol?

Symbol: Ba
‣ What is the atomic weight of barium?

Standard atomic weight: 137.327
‣ What block does barium belong to?

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

Group: 2 (alkaline earth metals)
‣ What period does barium belong to?

Period: 6
‣ What is the atomic radius of barium?

Atomic radius: empirical: 222 pm
Covalent radius of barium: 215±11 pm
Barium Van der Waals radius: 268 pm
‣ What is barium’s melting point?

Melting point: 1000 K (727 °C, 1341 °F)
Boiling point of barium: 2117 K (1845 °C, 3353 °F)
‣ How many electron shells does barium have?

Electrons per shell: 2, 8, 18, 18, 8, 2
‣ What is barium electron configuration?

Electron configuration: [Xe] 6s2
‣ What is barium ionization energy?

Ionization energies:
1st: 502.9 kJ/mol
2nd: 965.2 kJ/mol
3rd: 3600 kJ/mol
‣ What is the phase of barium?

Phase (at r.t): solid
‣ What is barium’s density?

Density (near r.t): 3.51 g/cm3
when liquid (at m.p): 3.338 g/cm3
Barium magnetic ordering: paramagnetic
Barium natural occurrence: primordial
‣ What is the oxidation state of barium?

Oxidation state: +2
Electronegativity of barium: Pauling scale: 0.89
Barium heat of fusion: 7.12 kJ/mol
Barium heat of vaporization: 142 kJ/mol
Barium molar heat capacity: 28.07 J/(mol K)
Barium molar magnetic susceptibility: +20.6 × 10-6 cm3/mol
Speed of sound in barium: 1620 m/s (at 20 °C)
Barium crystal structure: body-centered cubic (bcc)
Thermal expansion of barium: 20.6 µm/(m.K) (at 25 °C)
Thermal conductivity of barium: 18.4 W/(m.K)
Barium electrical resistivity: 332 nΩ.m (at 20 °C)
‣ Hardness of barium

Mohs hardness: 1.25
Young’s modulus of barium: 13 GPa
Shear modulus of barium: 4.9 GPa
Bulk modulus of barium: 9.6 GPa
Barium CAS number: 7440-39-3

‣ Barium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)91110381185138816862170

‣ How many isotopes does barium have?

Main isotopes of barium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
130Ba0.11 %(0.5-2.7) × 1021 yεε130Xe
132Ba0.10 %stable
133Basyn10.51 yε133Cs
134Ba2.42 %stable
135Ba6.59 %stable
136Ba7.85 %stable
137Ba11.23 %stable
138Ba71.70 %stable

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