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The electron pair arrangement that minimizes repulsion for 3 pairs of electrons is trigonal planar. The angles between electron pairs are 120. The molecular geometry is the arrangement of the central atom and the atoms bonded directly to it. In BF3, all 3 electron pairs around boron are bonding pairs.
The atoms in a Lewis structure tend to share electrons so that each atom has eight electrons (the octet rule). The octet rule states that an atom in a molecule will be stable when there are eight electrons in its outer shell (with the exception of hydrogen, in which the outer shell is satisfied with two electrons).here the symbol represents the element (in this case, hydrogen, helium, and carbon) and the dots represent the electrons in the outer shell (in this case, one, two, and four). These diagrams are based on the electron structures learned in the Atomic Structure and Periodic Table chapters.