Chapter 1 I- Fill the following table. Element symbol and the mass no. Ca-40 Ca 2+ -40 O-17 O 2- -16 C-12 C-13 Atomic number n p n n n e II - Choose the correct answer for the following: 1. Consider the atoms of 65 Cu and 65 Zn. Both of these atoms have the same a. number of electrons. b. number of ions. c. number of neutrons. d. mass number. e. number of protons. 1
2. Which has 24 neutrons is 52 a. Cr 24 55 25 b. Mn 24 c. Mg 12 45 21 51 23 d. Sc e. V 26 27 3. Compare 12Mgand 13 Al. In what respect do these species differ? I. number of neutrons, and number of electrons. II. number of protons, and number of neutrons. III. mass number and number of protons. a. I only b. II only c. III only d. I and III e. I, II, and III 4. Which description below fits I-131 atom? a. 39 protons, 78 neutrons, 39 electrons b. 53 protons, 78 neutrons, 53 electrons c. 52 protons, 79 neutrons, 54 electrons d. 53 protons, 131 neutrons, 53 electrons e. 54 protons, 131 neutrons, 54 electrons 5. How many protons, neutrons, and electrons are in the ion, 57 Fe 3+? a. 27 protons, 30 neutrons, and 30 electrons b. 26 protons, 31 neutrons, and 23 electrons c. 29 protons, 28 neutrons, and 26 electrons d. 26 protons, 31 neutrons, and 29 electrons e. 25 protons, 32 neutrons, and 22 electrons 6. Which atom has the smallest radius? a. Ca b. Ba c. K d. Mg e. C 7. Arrange the following in terms of decreasing radius values. a. P > Ga > Ge > As b. As > P > Ga > Ge c. Ga > Ge > As > P d. Ge > P > As > Ga e. Ga > P > As > Ge 2
8. The modern periodic table is arranged by increasing atomic mass by increasing atomic number alphabetically 9. Ions are atoms of an element that have different numbers of protons atoms of an element that have different numbers of neutrons atoms that have a charge 10. What particles are found in the nucleus of an atom? protons and neutrons protons and electrons neutrons and electrons 11. Which particle has a charge of zero? proton neutron electron 12. The atomic number tells the number of electrons in the atom number of protons in the atom number of neutrons in the atom 13. The horizontal rows of the periodic table are known as groups series periods 14. The vertical columns of the periodic table are known as groups series periods 15. Atomic number 27 represents which element? Al Co Ar 16. Comparing the neutral atom Cl with the negative ion Cl, the negative ion has the same number of electrons as the neutral atom fewer electrons than the neutral atom more electrons than the neutral atom 17. The ion, N 3, has 7 electrons 10 electrons 4 electrons 3
18. A magnesium ion, Mg 2+, has 12 protons 10 protons 14 protons 19. Positive ions are called anions cations blocks 20. An anion has a charge. negative positive neutral 21. Elements in the modern version of the periodic table are arranged in order of increasing. A) oxidation number B) atomic mass C) atomic mass D) atomic number E) number of isotopes 22. The ionization energies of the elements as you go from left to right across a period of the periodic table, and as you go from the bottom to the top of a group in the table. A) increase, increase B) increase, decrease C) decrease, increase D) decrease, decrease E) are completely unpredictable 23. In general, as you go across a period in the periodic table from left to right: (1) the atomic radius ; (2) the electron affinity becomes ; and (3) the first ionization energy. A) decreases, decreases, increases B) increases, increases, decreases C) increases, increases, increases D) decreases, increases, increases E) decreases, increases, decreases 24. Atomic radius generally increases as we move. A) down a group and from right to left across a period B) up a group and from left to right across a period C) down a group and from left to right across a period D) up a group and from right to left across a period E) down a group; the period position has no effect 4
25. Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and Ar? A) Mg > Na > P > Si > Ar B) Ar > Si > P > Na > Mg C) Si > P > Ar > Na > Mg D) Na > Mg > Si > P > Ar E) Ar > P > Si > Mg > Na 26. Which one of the following atoms has the largest radius? A) O B) F C) S D) Cl E) Ne 27. Which one of the following has the smallest radius? A) Na B) Cl C) Fe D) P E) Br 28. Which one of the following elements has the largest atomic radius? A) O B) F C) Al D) P E) B 29. Which of the following correctly lists the five atoms in order of increasing size? A) O < F < S < Mg < Ba B) F < O < S < Mg < Ba C) F < O < S < Ba < Mg D) O < F < S < Ba < Mg E) F < S < O < Mg < Ba 30. Which of the following correctly lists the five atoms in order of increasing size A) F < K < Ge < Br < Rb B) F < Ge < Br < K < Rb C) F < K < Br < Ge < Rb D) F < Br < Ge < K < Rb E) F < Br < Ge < Rb < K 31. Of the choices below, which gives the order for first ionization energies? A) Cl > S > Al > Ar > Si B) Ar > Cl > S > Si > Al C) Al > Si > S > Cl > Ar D) Cl > S > Al > Si > Ar E) S > Si > Cl > Al > Ar 5
32. Of the following atoms, which has the largest ionization energy? A) Br B) O C) C D) P E) I 33. Of the following elements, which has the largest ionization energy? A) Na B) Al C) Se D) Cl E) Br 34. Of the following elements, which has the largest ionization energy? A) K B) Rb C) Sr D) Ca E) Ba 35. Of the following elements, which has the largest ionization energy? A) Se B) As C) S D) Sb E) Ge 36. Of the following elements, which has the largest ionization energy? A) B B) N C) P D) Si E) C 37. Of the elements below, has the largest ionization energy. A) Li B) K C) Na D) H E) Rb 38. Of the following elements, has the most electron affinity. A) Na B) Li C) Be D) N E) F 6
39. Of the following elements, has the most electron affinity. A) S B) Cl C) Se D) Br E) I 40. Of the following elements, has the most electron affinity. A) P B) Al C) Si D) Cl E) Br 41. Na can exists as a cation more than Cl. This is because. A) chlorine is a gas and sodium is a solid B) chlorine has a greater electron affinity than sodium does C) chlorine is bigger than sodium D) chlorine has a greater ionization energy than sodium does E) chlorine is more metallic than sodium 42. Of the elements below, is the most metallic. A) Na B) Ba C) Mg D) Ca E) Cs 43. In the generation of anions, the energy change (kj/mol) that an electron is. A) removes, required B) adds, required C) removes, released D) adds, released E) None of the above is correct. 44. The list that correctly indicates the order of metallic character is. A) B > N > C B) F > Cl > S C) Si > P > S D) P > S > Se E) Na > K > Rb 45. Which of the following correctly represents the electron affinity of Br? 7
III- Write (True) or (False) in the following statements: 46. The number of protons in the nucleus of an atom determines the order of elements in the periodic table. 47. From left to right, across a row on the periodic table, there is a gradual change in properties from nonmetallic to metallic properties. 48. In a neutral atom, the number of protons must equal the number of neutrons. IV- Short answer questions. Write the symbol of element of the following: 49. Which noble gas has the highest ionization energy? 50. Which noble gas has the largest atomic radius? 8