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- Which of the following ions is the most stable? A. Na- B. Rb- C. Cs- D. Na^2- E. Rb^2-According to Coulomb's law, which ionic compound A-D has the smallest electrostatic potential energy (i.e., closest to zero)? The size of the anion increases in the order F < CI < Br < I. Select one: a. NaF O b. NaCl c. NaBr d. Nal e. All have the same potential energy because the anions all have -1 charges.Which of the following sets are made of isoelectronic ions? a. B5-, Sr4-, As3-, Te2- b. F-, Cl-, Br-,I- c. Si2-, P2- , S2-, Cl2- d. C4-, N3-, O2-, F1-
- 1. Ch 7, Problem 106 and 108 First arrange the following groups of atoms in order of increasing size. Then arrange them in order of increasing order of first ionization energy. Explain your orders! Note: Simply stating the trend of "atomic radius increases down the periodic table" is not sufficient. Explain why. a. Rb, Na, Be b. Ве, С, О 2. a. How does electronegativity change as you go across the periodic table? Down the periodic table? Why? b. Hydrogen's location on the periodic table doesn't accurately reflect its relative electronegativity. Look at the Figure 8.3, which provides quantitative values for electronegativity (bigger number, more electronegative). If you were to place H between two elements on the 2nd row, where would it go? 3rd row? Etc. It is important to know where H fits into the trend so that you can predict dipole moments for X-H bonds.Consider the Lewis electron formulas for the following four Helium has dots and a charge of Radon has dots and a charge of The lead (II) ion has dots and a charge of The lead (IV) ion has dots and a charge of а. -2 b. -4 C. +2 or 2 d. +4 or 4 е. +3 or 3 f. 8 g. 0 h. 6 i. 10Arrange the following in increasing order of the indicated property: A. Mg²⁺, Na⁺, O²⁻ Ionic radius B. F, Cl, Br Electron affinity C. Be, B, Mg Nonmetallic property D. Co⁺, Co²⁺, Co³⁺ Ionization energy E. Al, Cl, P Diamagnetism F. P, F, K Electronegativity
- The first three ionization energies of an element X are IE₁ = 590 kJ.mol-¹ IE₂ = 645 kJ.mol-1 IE3=4912 kJ.mol-¹ What is the most likely formula for the stable ion of X? OA. X³+ B. X OC.X²+ D. X+Imagine a metallic element had been discovered and was named "Gondolium" (Gn).Gn was found to exhibit chemistry like that of an alkaline earth. Gn(s) + F2(g) → GnF2(s) Lattice energy for GnF2 -1950. kJ/mol First Ionization energy of Gn 450. kJ/mol Second Ionization energy of Gn 855 kJ/mol Electron affinity of F -327.8 kJ/mol Bond energy of F2 154 kJ/mol Enthalpy of sublimation (atomization) of Gn 195 kJ/mol Use the above data to calculate ΔH°f for gondolium fluoride.9. Based on the noble gas configuration below, how many valence electrons does an atom have? [Kr] 5s? 4d10 5p3 A. 2 В. 5 С. 13 D. 15 10.In the given chemical formula, PbS2, what oxidation number of lead is used? A. +1 В. +3 C. +2 D. +4
- Consider the Lewis electron formulas for the following four Lanthanum has dots and a charge of Lanthanum ion has dots and a charge of Sulfur has dots and a charge of Sulfide ion has dots and a charge of а. -2 b. -4 C. +2 or 2 d. +4 or 4 е. +3 or 3 f. 8 g. 0 h. 6 i. 10Which of the following species has a positive electron affinity value (only one)? Select one: O a. Br (g) + e - Br (g) Ob. O (g) + e - O) Oc. C (g) + e - C (g) d. Na (g) + e - Na (g) Oe. S (g) + e - S2 (g)Which of the following statements is/are true for the long form of the periodic table? A. It reflects the sequence of filling the electrons in the order of sub-energy levels s, p, d and f B. It helps to predict the stable valency states of the elements C. It reflects trends in physical and chemical properties of the elements D. It helps to predict the relative ionicity of the bond between any two elements