Cithakan:Infobox beryllium

Bèriliyum,  ₄Be

General properties
Pangucapan	/bəˈrɪliəm/ ​(bə-RIL-ee-əm)
Wujud	white-gray metallic
Bobot atom standar (Ar, standard)	7000901218310000000♠9.0121831(5)
Bèriliyum in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Be ↓ Mg litiyum ← bèriliyum → boron
Atomic number (Z)	4
Group	group 2 (alkaline earth metals)
Period	period 2
Element category	alkaline earth metal
Blok	s-block
Konfigurasi èlèktron	[He] 2s2
Electrons per shell	2, 2
Sipat angga
Phase at STP	solid
Melting point	1560 K ​(1287 °C, ​2349 °F)
Boiling point	2742 K ​(2469 °C, ​4476 °F)
Density (near r.t.)	1.85 g/cm3
when liquid (at m.p.)	1.690 g/cm3
Critical point	5205 K,  MPa (extrapolated)
Heat of fusion	12.2 kJ/mol
Heat of vaporization	292 kJ/mol
Molar heat capacity	16.443 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1462 1608 1791 2023 2327 2742
Atomic properties
Oxidation states	+2, +1 ​(an amphoteric oxide)
Electronegativity	Pauling scale: 1.57
Ionization energies	1st: 899.5 kJ/mol 2nd: 1757.1 kJ/mol 3rd: 14,848.7 kJ/mol (more)
Atomic radius	empirical: 112 pm
Covalent radius	96±3 pm
Van der Waals radius	153 pm
Spectral lines
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	12,890 m/s (at r.t.)
Thermal expansion	11.3 µm/(m·K) (at 25 °C)
Thermal conductivity	200 W/(m·K)
Electrical resistivity	36 nΩ·m (at 20 °C)
Magnetic ordering	diamagnetic
Magnetic susceptibility	−9.0·10−6 cm3/mol
Young's modulus	287 GPa
Shear modulus	132 GPa
Bulk modulus	130 GPa
Poisson ratio	0.032
Mohs hardness	5.5
Vickers hardness	1670 MPa
Brinell hardness	590–1320 MPa
CAS Number	7440-41-7
History
Discovery	Louis Nicolas Vauquelin (1798)
First isolation	Friedrich Wöhler & Antoine Bussy (1828)
Main isotopes of bèriliyum
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 7Be trace 53.12 d ε 7Li γ – 9Be 100% stable 10Be trace 1.39×106 y β− 10B

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