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9. The total number of protons and neutrons in the nucleus of an atom is its a. atomic number. B. Avogadro constant. C. mass number. D. number of neutrons. 10. What is the mass number of an ion that contains 23 protons, 22 electrons, and 11 neutrons? a) 23 b) 56 c) 33 d) 34 11. Of the following attractions which is generally the weakest attractive force between particles? a) Ionic bond b) Covalent bond c) Dipole - dipole force d) London dispersion force 12. Which of the following substances is most likely to have hydrogen bonding? a) Ammonia, NH; (g) b) Methane, CH₁ (g) c)Phosphine, PH; (g) d) All of the above

II. Of the following attractions which is generally the weakest attractive force between particles? a) Ionic bond c) Dipole - dipole force d) London dispersion force b) Covalent bond 12. Which of the following substances is most likely to have hydrogen bonding? a) Ammonia, NH3(g) b) Methane, CH4 (g) c)Phosphine, PH3 (g) d) All of the above Thinking/Inquiry /01