SYMBOL | Be | |
ATOMIC NUMBER | 4 | |
ATOMIC WEIGHT | 9.0122 | |
GROUP NUMBER | 2 | |
STANDARD STATE | SOLID | |
COLOUR | GREY | |
DISCOVERED | 1797 BY N - L VAUQUELIN IN FRANCE | |
ORIGIN OF NAME | FROM THE GREEKBERYLLOS MEANING BERYL | |
USES |
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|
ATOMIC RADIUS | 1.13 * 10-10M | |
COMPOUNDS |
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EFFECTIVE NUCLEAR CHARGE (Slater) | 1.95 | |
DENSITY | 1847.7 KgM-3 | |
MELTING POINT | 155 K | |
BOILING POINT | 3243 K (UNDER PRESSURE) | |
ENTHALPY OF FUSION | 9.80 KJMol-1 | |
ENTHALPY OF VAPOURISATION | 308.8 KJMol-1 | |
ISOTOPES | Be-6, Be-7, Be-8, Be-9, Be-10, Be-11, Be-12, Be-13 ALL RADIOACTIVE EXCEPT Be-9 | |
ELECTRON CONFIGURATION | 1S22S2 | |
FIRST IONISATION ENERGY | 899.4 KJMol-1 | |
ELECTRON AFFINITY | -18 KJMol-1 | |
SOURCES | MINED IN BRAZIL, U.S.A., MADAGASCAR, INDIA, GERMANY, RUSSIA AND THE CZECH REPUBLIC | |
GENERAL INFORMATION | A LAYER OF OXIDE WHICH FORMS ON ITS SURFACE ENABLES IT TO SCRATCH GLASS | |