ChemiPlus Logo
Dictionary - Training


 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance


Name: Beryllium Symbol: Be
Group: Alkali Earth Atomic weight: 9.01218
Density @ 293 K: 1.848 g/cm3 Atomic volume: 5.0 cm3/mol
Group: Alkali Earth discovered: 1797


state (s, l, g): s
melting point: 1551.2 K boiling point: 2773 K
Heat of fusion: 12.20 kJ/mol Heat of vaporization: 292.40 kJ/mol


1st ionization energy: 899.4 kJ/mole
electronegativity: 1.57 2nd ionization energy: 1757.1 kJ/mole
electron affinity: kJ/mole 3rd ionization energy: 14848.3 kJ/mole
Specific heat: 1.82 J/gK heat atomization: 324 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,2 electron configuration: [He] 2s2
minimum oxidation number: 0 maximum oxidation number: 2
min. common oxidation no.: 0 max. common oxidation no.: 2

Appearance & Characteristics:

structure: hcp: hexagonal close pkd color: steel gray
uses: Cu alloys, X-ray windows toxicity: yes
hardness: mohs characteristics: toxic


reaction with air: vigorous, w/ht=>BeO,Be3N2
reaction with 6M HCl: mild, =>H2 reaction with 6M HCl: mild, =>H2
reaction with 15M HNO3: none reaction with 6M NaOH: mild, =>H2, [Be(OH)4](2-)

Other Forms:

number of isotopes: 1 hydride(s): BeH2
oxide(s): BeO chloride(s): BeCl2


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 112 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): 59 pm ionic radius (3+ ion): pm


thermal conductivity: 201 J/m-sec-deg
electrical conductivity: 250 1/mohm-cm polarizability: 5.6 A^3


source: Beryl (silicate)
rel. abund. solar system: -0.137 log abundance earth's crust: 0.4 log
cost, pure: 530 $/100g cost, bulk: 59 $/100g