This is because butterfly caterpillars are host specific. Plant-wise, the caterpillars of some butterfly species like asters, black-eyed Susan, clover, lupines, milkweed, sedum or violets. Aspen, birch, cherry, hackberry, oak or willow trees make caterpillars of other butterfly species equally happy.
each Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.ach Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.
If % ionic character is less than 5%, bond is nonpolar. Al = 1.5 Cl = 3.0 % ionic character = (3.0 â 1.5) Ã· 3.0 = 50% The 3 Al â Cl bonds are polar covalent The Al has partial positive charge and the 3 Clâs have a partial negative charge.The molecule is polar.See images at the web site below http://www.google.com/search?q=AlCl3&rls...hese values and bond character scale are from the Sargent-Welch periodic table. Here's another source: http://www.green-planet-solar-energy.com... Bond character is basically a spectrum between ionic and covalent, and AlCl3 looks like it's close to middle.