covalent radii造句

• Often the polar covalent bonds are shorter than would be expected on the basis of the sum of covalent radii.
• Briefly, if the distance between two atoms is less than the sum of their covalent radii, they are considered bonded.
• Tabulated values of covalent radii are either average or idealized values, which nevertheless show a certain transferability between different situations, which makes them useful.
• Finally, the most accurate value for the covalent radius of fluorine has been found by plotting the covalent radii against the electronegativity ( see figure ).
• The atoms are different sizes and have different covalent radii ( related to bond-length to C ), so anything that relies on the part of a molecule having a certain physical shape or atomic position may be affected.
• Sanderson has published a recent set of non-polar covalent radii for the main-group elements, but the availability of large collections of bond lengths, which are more transferable, from the Cambridge Crystallographic Database has rendered covalent radii obsolete in many situations.
• Sanderson has published a recent set of non-polar covalent radii for the main-group elements, but the availability of large collections of bond lengths, which are more transferable, from the Cambridge Crystallographic Database has rendered covalent radii obsolete in many situations.
• Carbon's covalent radii are normally taken as 77.2 pm ( C C ), 66.7 pm ( C = C ) and 60.3 pm ( Ca " C ), although these may vary depending on coordination number and what the carbon is bonded to.
• :( where " d AB " is the predicted bond length or distance between two atoms, " r A " and " r B " are the covalent radii ( in picometers ) of the two atoms, and " | xA  xB | " is the absolute difference in the electronegativities of elements A and B . " C " is a constant which Schomaker and Stevenson took as 9 pm .)