(a) Interpretation: The number of moles of Cl − ion present in the sample is to be calculated. Concept introduction: Moles of the chloride ion are equal to the moles of the silver ion added in the system in the titration of the chloride ion sample with silver nitrate. Numbers of moles are defined as the given mass of the species divided by the molar mass of that species.

Question

(9 Pts) In one of the two Rare Earth element rows of the periodic table, identify an exception tothe general ionization energy (IE) trend. For the two elements involved, answer the followingquestions. Be sure to cite sources for all physical data that you use.a. (2 pts) Identify the two elements and write their electronic configurations.b. (2 pts) Based on their configurations, propose a reason for the IE trend exception.c. (5 pts) Calculate effective nuclear charges for the last electron in each element and theAllred-Rochow electronegativity values for the two elements. Can any of these valuesexplain the IE trend exception? Explain how (not) – include a description of how IErelates to electronegativity.

Answer 1

Question

Chapter 7, Problem 2ASA

Interpretation Introduction

(a)

Interpretation:

The number of moles of Cl− ion present in the sample is to be calculated.

Concept introduction:

Moles of the chloride ion are equal to the moles of the silver ion added in the system in the titration of the chloride ion sample with silver nitrate. Numbers of moles are defined as the given mass of the species divided by the molar mass of that species.

Interpretation Introduction

(b)

Interpretation:

The concentration of the chloride ion in the diluted solution is to be determined.

Concept introduction:

The concentration of the chloride ion present in the unknown sample is determined by the argentometric titration. The chloride ion sample is titrated with the silver nitrate solution to calculate the concentration of the chloride ion.

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(9 Pts) In one of the two Rare Earth element rows of the periodic table, identify an exception tothe general ionization energy (IE) trend. For the two elements involved, answer the followingquestions. Be sure to cite sources for all physical data that you use.a. (2 pts) Identify the two elements and write their electronic configurations.b. (2 pts) Based on their configurations, propose a reason for the IE trend exception.c. (5 pts) Calculate effective nuclear charges for the last electron in each element and theAllred-Rochow electronegativity values for the two elements. Can any of these valuesexplain the IE trend exception? Explain how (not) – include a description of how IErelates to electronegativity.

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