ទំព័រគំរូ:Infobox boron

Boron
5B
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline earth metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (other metals)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline earth metal)
Scandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Chromium (transition metal)
Manganese (transition metal)
Iron (transition metal)
Cobalt (transition metal)
Nickel (transition metal)
Copper (transition metal)
Zinc (transition metal)
Gallium (other metals)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline earth metal)
Yttrium (transition metal)
Zirconium (transition metal)
Niobium (transition metal)
Molybdenum (transition metal)
Technetium (transition metal)
Ruthenium (transition metal)
Rhodium (transition metal)
Palladium (transition metal)
Silver (transition metal)
Cadmium (transition metal)
Indium (other metals)
Tin (other metals)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline earth metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Rhenium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Gold (transition metal)
Mercury (transition metal)
Thallium (other metals)
Lead (other metals)
Bismuth (other metals)
Polonium (other metals)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline earth metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Ununtrium (unknown chemical properties)
Flerovium (unknown chemical properties)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)


B

Al
berylliumboroncarbon
Boron នៅក្នុងតារាងខួបនៃធាតុគីមី
រូបរាង
black-brown

boron (β-rhombohedral)[]
លក្ខណៈទូទៅ
ឈ្មោះ, និមិត្តសញ្ញា, លេខ boron, B, 5
Pronunciation /ˈbɔərɒn/
ក្រុម, ខួប, block 13, 2, p
ទម្ងន់អាតូម {{{atomic mass}}}
លេខអេឡិចត្រុង [He] 2s2 2p1
2, 3
Physical properties
Phase solid
ដង់ស៊ីតេអង្គធាតុរាវ នៅ ចំណុចរលាយ 2.08 g·cm−3
ចំណុចរលាយ 2349 K, 2076 °C, 3769 °F
ចំណុចរំពុះ 4200 K, 3927 °C, 7101 °F
Heat of fusion 50.2 kJ·mol−1
Heat of vaporization 508 kJ·mol−1
Molar heat capacity 11.087 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2348 2562 2822 3141 3545 4072
Atomic properties
ចំនួនអុកស៊ីតកម្ម 3, 2, 1, −1, −5
((a mildly acidic oxide))
អេឡិចត្រូនេកាទីវ 2.04 (Pauling scale)
Ionization energies
(more)
1st: {{{1st ionization energy}}} kJ·mol−1
2nd: {{{2nd ionization energy}}} kJ·mol−1
3rd: {{{3rd ionization energy}}} kJ·mol−1
Atomic radius 90 pm
Covalent radius 84±3 pm
Van der Waals radius 192 pm
Miscellanea
ទម្រង់គ្រីស្តាល rhombohedral
Magnetic ordering diamagnetic
Electrical resistivity (20 °C) ~106Ω·m
Thermal conductivity 27.4 W·m−1·K−1
Thermal expansion (25 °C) β form: 5–7 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 16,200 m·s−1
Mohs hardness ~9.5
CAS registry number 7440-42-8
History
Discovery Joseph Louis Gay-Lussac and Louis Jacques Thénard[] (30 June 1808)
First isolation Humphry Davy[] (9 July 1808)
Most stable isotopes
Main article: Isotopes of boron
iso NA half-life DM DE (MeV) DP

ទំព័រគំរូ:Infobox element/isotopes stable[] ទំព័រគំរូ:Infobox element/isotopes stable[]

10B content may be as low as 19.1% and as high as 20.3% in natural samples. 11B is the remainder in such cases.[]
· references

Element navigation

boronPT
 ←
 
→ 

ឯកសារយោង

  1. Van Setten et al. 2007, pp. 2460–1
  2. (1808). "Sur la décomposition et la recomposition de l'acide boracique". Annales de chimie 68: 169–174.
  3. Davy H (1809). "An account of some new analytical researches on the nature of certain bodies, particularly the alkalies, phosphorus, sulphur, carbonaceous matter, and the acids hitherto undecomposed: with some general observations on chemical theory". Philosophical Transactions of the Royal Society of London 99: 39–104. DOI:10.1098/rstl.1809.0005.
  4. ៤,០ ៤,១ "Atomic Weights and Isotopic Compositions for All Elements". National Institute of Standards and Technology. Retrieved 2008-09-21.
  5. Szegedi, S. (1990). "Determination of boron in glass by neutron transmission method". Journal of Radioanalytical and Nuclear Chemistry Letters 146 (3): 177. DOI:10.1007/BF02165219.