# PERIODIC TABLE OF THE ELEMENTS

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1 Useful Constants and equations: K = o C Avogadro's number = x d = density = mass/volume R H = x J c = E = h = hc/ h = x J s c = x 10 8 m/s E n = -R H Z 2 (1/n 2 ), Z = atomic number E - R HZ 2 R = L atm / mol K n f n i 2 1 1A 1 H Li Na K Rb Cs Fr A 4 Be Mg PERIODIC TABLE OF THE ELEMENTS 26 Fe Atomic number Atomic mass Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Sr Ba Ra Y La * Ac Zr Hf Rf Nb Ta Db Mo W Sg Tc Re Bh Ru Os Hs Rh Ir Mt Pd Pt Ds Ag Au Cd Hg A 5 B Al Ga In Tl A 6 C Si Ge Sn Pb A 7 N P As Sb Bi A 8 O S Se Te Po A 9 F Cl Br I At A 2 He Ne Ar Kr Xe Rn 222 * Lanthanides Actinides 58 Ce Th Pr Pa Nd U Pm Np Sm Pu Eu Am Gd Cm Tb Bk Dy Cf Ho Es Er Fm Tm Md Yb No Lu Lr 260

2 1. (3) A particular isotope of an element has a mass number of 152. There are 60 electrons in the +2 ion of the isotope. Identify the element, the number of protons and the number of neutrons of this particular isotope. a) 62 protons, 90 neutrons : Sm b) 66 protons, 86 neutrons : Dy c) 60 protons, 92 neutrons : Nd d) 63 protons, 89 neutrons : Eu e) 57 protons, 95 neurons : La 2. (4) A sample of water has a mass of g at 24.0 o C. The density of water at 24.0 o C is g/ml. What is the volume of the water, in L and to the correct number of significant figures. a) x 10-1 b) x 10-1 c) 2.36 x 10-1 d) 2.36 x 10 1 e) x (4) The atomic weight of Cu is There are only two naturally occurring isotopes of copper, 63 Cu and 65 Cu. The natural abundance of the 63 Cu isotope must be approximately: a) 10% b) 30% c) 50% d) 70% e) 90% 4. (4) Which of the following compounds is named correctly? a) SnO 2 tin(ii) oxide b) NaNO 2 sodium nitrate c) NO nitrogen oxide d) Al 2 S 3 dialuminum trisulfide e) Na 2 O 2 sodium peroxide 5. (3) Which element is expected to be most chemically similar to phosphorus? a) S b) As c) Se d) Ge e) Si 6. (3) The element dysprosium, Dy, forms an oxide with the formula Dy 2 O 3. The corresponding bromide of dysprosium has the formula: a) Dy 2 Br 3 b) DyBr c) DyBr 2 d) DyBr 3 e) Dy 3 Br 2

3 7. (4) A fluoride salt of an alkaline earth metal has a molar mass of 78 g/mol. What is the formula of this salt? a) CaF 2 b) NaF 2 c) KF d) SrF 2 e) LiF 8. (4) A hydrogen atom with its electron in the n=3 energy level absorbs light with a wavelength of 1879 nm. The final energy level of the electron is? a) n = 1 b) n = 2 c) n = 4 d) n = 5 e) n = 6 9. (4) How many of the following elements have an incorrect electron configuration? Fe [Ar] 4s 2 3d 6 At [Xe] 6s 2 5d 10 6p 5 Os [Xe] 6s 2 5d 6 S [He] 3s 2 3p 4 Sr [Kr] 5s 2 a) one b) two c) three d) four e) five 10. (3) Which of the following has the largest number of unpaired electrons? a) Zn b) Bi c) Pd d) Te e) Rb 11. (3) Which of the following sets of quantum numbers is not possible? a) n = 1, l = 0, m l = 0 b) n = 3, l = 2, m l = -1 c) n = 4, l = 4, m l = 1 d) n = 2, l = 1, m l = -1 e) n = 6, l = 1, m l = (4) Consider the following series of elements/ions: I. Al < Si < P < S II. Be < Mg < Ca < Sr III. I < Br < Cl < F IV. Na + < Mg 2+ < Al 3+ < Si 4+ Which gives the correct trend in size? a) I b) II c) III d) IV e) II and IV

4 13. (4) How many of the following sets represent an isoelectronic series? I. S +, Cl 2+, Ar, K - II. Ga 2-, As, Br 2+, Rb 4+ III. Li +, Na +, K +, Rb + IV CH 4, BH - + 4, NH 4 V. Mg 2-, Na -, Ne, F + a) 1 b) 2 c) 3 d) 4 e) (3) Of the following, the atom with the largest first ionization energy is the one with the electron configuration: a) [Ne] 3s 2 3p 2 b) [Ne] 3s 2 3p 3 c) [He] 2s 2 2p 4 d) [He] 2s 2 2p 3 e) [Ar] 4s 2 3d 10 4p (3) Which of the following elements has the largest second ionization energy? a) Mg b) Al c) Na d) Li e) Ca Shown below are four energy diagrams. Use these to answer the next two questions. 16. (3) Which of these energy diagrams describes the ground state of copper, Cu? a) b) c) d) e) none of them (a-d) 17. (3) Which of these energy diagrams describes an excited state of copper, Cu? a) b) c) d) e) none of them (a-d)

5 Shown below are five covalent compounds. Use them to answer the next two (2) questions: SCl 2 SiCl 4 PCl 5 Cl 2 NCl (3) In which compound are the bonds most polar? a) SCl 2 b) SiCl 4 c) PCl 5 d) Cl 2 e) NCl (3) How many of these compounds are polar? a) 1 b) 2 c) 3 d) 4 e) 5 Draw the Lewis structures for the following compounds and use this information to answer the next four questions. I. SeO 2 II. XeCl 4 III. HCN IV. CO (3) How many of these compounds exhibit resonance? a) 0 b) 1 c) 2 d) 3 e) (3) How many of these compounds are polar? a) 0 b) 1 c) 2 d) 3 e) (3) How many of these compounds have a central atom with sp 2 hybridization? a) 0 b) 1 c) 2 d) 3 e) (3) What is the largest (most positive) formal charge in CO 2-3? a) +2 b) +1 c) 0 d) -1 e) -2

6 Shown to the right is the incomplete structure of the artificial sweetener, Aspartame. Complete the structure and use it to answer the next three (3) questions. 24. (3) How many bonds are present in this structure? a) 2 b) 3 c) 4 d) 5 e) (3) What are the approximate bond angles around the starred atoms in this compound? C N O a) b) c) d) e) (3) The energy diagram below corresponds to which of the starred atoms? a) C * b) O * c) N * d) more than one of them e) none of them

7 Draw the Lewis structures for the following compounds and use this information to answer the next four questions. I. IF 3 II. SeCl 4 III. SO 3 IV. ClF (3) Which of these compounds obeys the octet rule? a) I b) II c) III d) IV e) more than one of them (I - IV) 28. (3) Which of these compounds has a central atom with d 2 sp 3 hybridization? a) I b) II c) III d) IV e) more than one of them (I - IV) 29. (3) Which of these compounds has a formal charge of +2 on the central atom? a) I b) II c) III d) IV e) more than one of them (I - IV) 30. (3) How many of these compounds are matched to their correct molecular shape? IF 3 SeCl 4 SO 3 ClF 5 T shaped square planar trigonal planar square pyramidal a) 0 b) 1 c) 2 d) 3 e) 4 Shown below is the Lewis structure of a compound with an unknown central atom, X. Use this structure to answer the next two questions. 31. (3) Which of the atoms listed below could be X? F F X S F 3- a) C b) O c) Cl d) Se e) more than one of these (a-d) could be X 32. (3) This ion is: a) square planar and polar b) square planar and non-polar c) see saw shaped and polar d) see saw shaped and non-polar e) none of the above (a-d)

8

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