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


Name Beryllium Symbol Be
atomic number 4 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
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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
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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-)
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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
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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
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.