Boron Element (Periodic Table)

Boron

Boron (B) is a chemical element of the periodic table, located in the group 13 and the period 2, and is having the atomic number 5. It is a dark, lustrous, black-brown metalloid, whose name comes from the Arabic word “buraq”, which means the mineral borax. It is the first element in the boron group and is the lightest element of the boron group.

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
– p block

FAQs on Boron Element

Boron
‣ What does boron look like?

Appearance: black-brown
‣ When was boron discovered and by whom?

Discovery: Joseph Louis Gay-Lussac and Louis Jacques Thenard (30 June 1808)
First isolation: Humphry Davy (9 July 1808)
‣ Where is boron found on the periodic table?

Boron Periodic Table

Location: Boron is found in the second row of the periodic table above the aluminium element.
‣ What is boron’s atomic number?

Atomic number (Z): 5
‣ What is the chemical symbol for boron?

Symbol: B
‣ What is the atomic weight of boron?

Standard atomic weight: [10.806, 10.821] conventional: 10.81
‣ Boron belongs to which block?

Block: p-block
‣ What group does boron belong to on the periodic table?

Group: 13 (boron group)
‣ What period is boron in on the periodic table?

Period: 2
‣ What is boron atomic radius?

Atomic radius: empirical: 90 pm
Boron covalent radius: 84±3 pm
Boron Van der Waals radius: 192 pm
‣ What is boron melting point?

Melting point: 2349 K (2076 °C, 3769 °F)
‣ What is the boiling point of boron?

Boiling point: 4200 K (3927 °C, 7101 °F)
‣ How many electron shells does boron have?

Electrons per shell: 2, 3
‣ What is the ground state electron configuration of boron?

Electron configuration: [He] 2s2 2p1
‣ How many allotropes of boron?

Allotropes:
α-rhombohedral,
β-rhombohedral,
β-tetragonal
‣ What is boron ionization energy?

Ionization energies:
1st: 800.6 kJ/mol
2nd: 2427.1 kJ/mol
3rd: 3659.7 kJ/mol
‣ What phase is boron at room temperature?

Phase (at r.t): solid
‣ What is the density of boron?

Density when liquid (at m.p): 2.08 g/cm3
Boron magnetic ordering: diamagnetic
Boron natural occurrence: primordial
‣ What is the oxidation state of boron?

Oxidation state: +3
‣ What is the electronegativity of boron?

Electronegativity: Pauling scale: 2.04
Boron heat of fusion: 50.2 kJ/mol
Boron heat of vaporization: 508 kJ/mol
Boron molar heat capacity: 11.087 J/(mol K)
Boron molar magnetic susceptibility: -6.7 × 10-6 cm3/mol
Speed of sound in boron: 16,200 m/s (at 20 °C)
‣ What the crystal structure of boron?

Crystal structure: rhombohedral
Thermal expansion of boron: β form: 5-7 µm/(m.K) (at 25 °C)
Thermal conductivity of boron: 27.4 W/(m.K)
Boron electrical resistivity: ~106 Ω.m (at 20 °C)
‣ What is the hardness of boron?

Mohs hardness: ~9.5
Boron CAS number: 7440-42-8

‣ Boron vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)234825622822314135454072

‣ How many isotopes does boron have?

Main isotopes of boron
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
10B20 %stable
11B80 %stable

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