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Across 5. a covalent bond in which one atoms contributes both bonding electrons 9. when a pi molecular orbital is fileld with two electrons 10. a compound that is composed of molecules 16. a structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electrons pairs for a molecule or ion 17. the repulsion between electron pairs which cause molecular shapes to adjust so that the valence electron pairs stay as far apart as possible 18. a neutral group of atoms joined together by covalent bonds 19. atomic orbitals that mix to form the same total number of equivalent hybrid orbitals 20. atoms held together by sharing electrons are joined by this type of bond

Down 1. two atoms held together by sharing a pair of electrons 2. energy required to break a bond between two covalently bonded atoms 3. orbitals that apply to the entire molecule 4. two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting two atomic nuclei 6. two weakest attractions between molecules 7. a molecular orbital that can be occupied by two electrons of a covalent bond 8. a molecule consisting of two atoms 11. a chemical formula of a molecule or compound that shows the kinds and numbers of atoms present in a compound 12. a pair of valence electrons that are not shared between atoms 13. represents the covalent bonds by dashes and shows the arrangement of covalently bonded atoms 14. an angle of 109.5 degrees between H, C, and h 15. a tightly bound group of atoms that has a positive or negative charge and behaves a a unit