Periodicity & Chemical Bonding "Homework Help" General Chem 30. How does ionization energy change as one proceeds a) across the periodic table in a horizontal row b) down the periodic table in a vertical group Give an explantion for each answer. 31. Arrange the following atoms or ions in order of increasing radius: Cl,S2-,K,K+,O Give an explanation for the position S2- in relation to the atom or ion that comes just before and just after it. 32. What is the relationship between first ionization energies and metallic and non-metallic properties? 33. Identify two repulsive forces and two attrative forces that influences the formation of chemical bonds between two atoms. 34. Which of these bonds is most polart and which is least: S--O, Cl--Cl, or Cl--O? Justify your arrangement. 35. a) What is meant by octet structure? b) What evidence indicates that octet structures might be more stable than others? 36. What is meant by co-ordinate covalent bond? 37. Explain why you would expect a BeF2 molecule to be linear but an SF2 molecule to be an angular. 38. a) How would you designate the hybrid orbitals formed by "mixing" one d one s and two p orbitals? b) How many of the hybrid prbitals would be formed by the mixing? 39. Explain why C20H40 os a solid at 25degreesC, while C4H8 is a gas at 25degreesC.