Element Boron

Boron ElementIt is an element with atomic symbol B, atomic number 5, and atomic weight 11.
Boron atom is a nonmetal atom, a boron group element atom and a metalloid atom. It has a role as a micronutrient.
Boron is a compound that occurs in nature.
It is often found combined with other substances to form compounds called borates.
Common borate compounds include boric acid, salts of borates, and boron oxide.
Borates are used mostly to produce glass. They are also used in fire retardants, leather tanning industries, cosmetics, photographic materials, soaps and cleaners, and for high-energy fuel. Some pesticides used for cockroach control and some wood preservatives also contain borates.

Names and Identifiers

Chemical Formula:B
CAS:7440-42-8
Molecular Weight:13.83480 g/mol
EC Number :231-151-2
MDL Number:MFCD00134034
Color:black
Other Names:Bore, Bor
PubChem CID:5462311
IUPAC Name:Boron
Inchl:InChI=1S/B
InChI Key:ZOXJGFHDIHLPTG-UHFFFAOYSA-N
Canonical SMILES:[B]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:2.08 g/cm³
Boiling Point:4200 K ​(3927 °C, ​7101 °F)
Melting Point:2349 K ​(2076 °C, ​3769 °F)
Molecular Formula:B
Flash Point:n/a
Exact Mass:14.03280
Symbol:Globally Harmonized System of Classification
Signal Word:Warning
Hazard Statements:H302
Precautionary Statements:n/a
Hazard Codes:Xn: Harmful;F: Flammable;
Risk Phrases:R11
Safety Phrases:S24/25
RIDADR:UN 3178 4
WGK Germany:n/a
RTECS:n/a
Packaging Group:III
Hazard Class:4.1

Both isotopes of Boron, B-10 and B-11, are used extensively in the nuclear industry.
B-10 is used in the form of boric acid as a chemical shim in pressurized water reactors while in the form of sodium pentaborate it is used for standby liquid control systems in boiling water reactors. B-11 can be used as a neutron reflector.
Outside the nuclear industry both isotopes are used as food label to study boron metabolism.
B-10 is also used in so-called boron neutron capture therapy (BNCT). Both B-10 and B-11 can be used for the production of two radioisotopes: C-11 and N-13.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
10B10.012 937 0(4)19.9 (7)31.80065
11B11.009 305 5(5)80.1 (7)3/22.688637

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
8B8.0246070.770 sEC to 8Be; EC + α to 4He; EC + 2 α to n21.0355
9B9.0133298 x 10-19 s2α to 1H; p to 8Be3/21.8006
12B12.0143520.0202 sβ to 12C; β + 3α to n11.0031
13B13.0177800.0174 sβ to 13C3/23.17778

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