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#6721 |
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It is not always easy to make sensible comparisons between the elements however as some bonds are quite short because of multiple bonding (for instance the O=O distance in O2 is short because of the the double bond connecting the two atoms.
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#6722 |
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There are several other ways ways to define radius for atoms and ions. Follow the appropriate hyperlinks for literature references and definitions of each type of radius. All values of radii are given in picometres (pm). Conversion factors are:
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#6723 |
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1 pm = 1 x 10-12 metre (meter)
100 pm = 1 Ångstrom 1000 pm = 1 nanometre (nm, nanometer) Neutral radii |
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#6724 |
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The size of neutral atoms depends upon the way in which the measurement is made and the environment.
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#6725 |
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Follow the appropriate hyperlinks for definitions of each radius type. The term "atomic radius" is not particularly helpful although its use is widespread. The problem is its meaning,
Be(II) 31 |
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#6726 |
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which is clearly very different in different sources and books. Two values are given here, one is based upon calculations and the other upon observation - follow the appropriate link for further details.
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#6727 |
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Atomic radius (empirical): 105 pm
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#6728 |
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Atomic radius (calculated): 112 pm
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#6729 |
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Covalent radius (2008 values): 96 pm
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#6730 |
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Molecular single bond covalent radii: 102 (coordination number 2) pm
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#6731 |
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Molecular double bond covalent radii: 90 pm
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#6732 |
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Molecular triple bond covalent radii: 85 pm
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#6733 |
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Covalent radius (empirical): 90 pm
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#6734 |
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van der Waals radius: no information pm
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#6735 |
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Beryllium ( /bəˈrɪliəm/ bə-RIL-ee-əm) is the chemical element with the symbol Be and atomic number 4.
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