Covalent Bond, Lewis Structures, Molecular Orbitals
Covalent bond: sharing electron pairs
Number of valence electrons for atom = Group number
Octet rule rule of 8; 8 electrons around main group atoms in molecules except H, two electrons
Rules for Lewis structures: COUNT valence electrons in molecules; put 2 electrons between bonded atoms; use remaining electrons to get 8 shared by other atoms in lone pairs and/or multiple bonds
Exceptions to octet rule: Be, B etc. in Groups 1 and 2; third period elements like S, P, can exceed 8.
Electronegativity: power of atom in a bond to attract electrons
Electronegativity decreases down a group; increases from left to right along a period
Bonds can be fully ionic; polar; non-polar
Overlaps of atomic orbitals can give molecular orbitals
Sigma orbitals: cylindrical symmetry around internuclear axis
Pi orbitals: plane of symmetry between nuclei
Covalent Bond, Lewis Structures, Molecular Orbitals
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