Elements
5

B

Boron

Boron (B) exists as either a brown powder or a crystalline silvery black solid. Is has the atomic number 5 in the periodic table and belongs in Group 13, its symbol is B. It is a metalloid and has both metal and non metal properties.

Boron’s most common use is in compounds such as Boric acid and Borax which are used in antiseptics, washing powders and glazes. It has been used since 300AD as a decorative glaze for tiles in Italy due to its colour and it is easily mixed with other compounds. Pure Boron is hard to isolate and it is most commonly found in ores in the earth’s crust or in compounds. This is because Boron with easily bond with Carbon producing carbon based compounds. It was isolated first in 1808 by Humphry Davy, Joseph Louis Gay Lussac and Louis Jacques Thenard who isolated it from the reaction of Potassium and Boric acid. It is located in Group 13. It is a solid at room temperature and it has a melting point of 2075°c and a boiling point of 4000°c. Boron is a solid at room temperature and exists as two allotropes.

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FAQ's

What is the Melting Point for Boron?

Boron has a Melting Point of 2200°F, meaning at 2200°F it will turn to a liquid.

What is the Boiling Point for Boron?

Boron has a Boiling Point of 2550°F, meaning at 2550°F it will turn to a Gas.

What is the Electronegativity of Boron?

Boron's Electronegativty is 2.04. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Boron?

Boron has a Heat of Vaporization of 489.7 kJ/mol.

Uses

Used with titanium & tungsten to make heat resistant alloys for jets & rockets.

Sources

Obtained from kernite, a kind of borax (Na2B4O7.10H2O). High purity boron is produced by electrolysis of molten potassium fluroborate and potassium chloride (KCl).

5
Protons
5
Electrons
6
Neutrons

B

Element Symbol
B
Atomic Weight
10.811
Atomic Number
5
State
Solid
Melting Point
Unknown
2200
°C
Boiling Point
2550
Unknown
°C
Heat of Vaporization
489.7
Unknown
kJ/mol
Crystal Structure
Rhombohedral
Thermoconductivity
0.27
Unknown
W/cmK
Shells
2,3
Group
Metalloid
Period
2
Block
P Block
Orbitals
[He] 2s2 2p1
Coefficient of Thermal Expansion
4.7 10^-6 K^-1
Covalent Radius
0.82 Å
Density at 293K
2.34 g/cm³
Electrical Conductivity
1.0e-12 10^6/cm ohm
First Ionization Potential
8.2980 V
Second Ionization Potential
25.154 V
Third Ionization Potential
37.93 V
Ionic Radius
.23 (+3) Å
Oxydation States
3
Lattice Parameter
8.80 Å
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

BO-ron

Discovered by

Sir H. Davy, J.L. Gay-Lussac, L.J. Thénard

Discovery date

1808

Orbital configuration
2,3

Download the Periodic Table

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28.085
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Si

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Metalloids are the chemical elements with the properties intermediate between those of typical metals and nonmetals. There is neither standard definition of a metalloid nor agreement on elements classified as such.
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6