Among the given isotopes of boron, identify the most stable isotope. Boron-8, boron-10, boron-12. Concept Introduction: The stability of isotopes is based on their half lives. Longer the time required to decompose to half of initial concentration higher the stability. However, the half lives are not given here so we have to go with the rule of stability of isotopes as. For the elements with atomic number less than 20, the isotope will be stable if. n p = 1 Where, n is number of neutrons. p is number of protons.

Question

(15 pts) Consider the molecule B2H6. Generate a molecular orbital diagram but this time using a different approach that draws on your knowledge and ability to put concepts together. First use VSEPR or some other method to make sure you know the ground state structure of the molecule. Next, generate an MO diagram for BH2. Sketch the highest occupied and lowest unoccupied MOs of the BH2 fragment. These are called frontier orbitals. Now use these frontier orbitals as your basis set for producing LGO's for B2H6. Since the BH2 frontier orbitals become the LGOS, you will have to think about what is in the middle of the molecule and treat its basis as well. Do you arrive at the same qualitative MO diagram as is discussed in the book? Sketch the new highest occupied and lowest unoccupied MOs for the molecule (B2H6).

Answer 1

Question

Chapter 9, Problem 9.16P

Interpretation Introduction

Interpretation:

Among the given isotopes of boron, identify the most stable isotope.

Boron-8, boron-10, boron-12.

Concept Introduction:

The stability of isotopes is based on their half lives. Longer the time required to decompose to half of initial concentration higher the stability.

However, the half lives are not given here so we have to go with the rule of stability of isotopes as.

For the elements with atomic number less than 20, the isotope will be stable if.

np=1

Where,

n is number of neutrons.

p is number of protons.

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(15 pts) Consider the molecule B2H6. Generate a molecular orbital diagram but this time using a different approach that draws on your knowledge and ability to put concepts together. First use VSEPR or some other method to make sure you know the ground state structure of the molecule. Next, generate an MO diagram for BH2. Sketch the highest occupied and lowest unoccupied MOs of the BH2 fragment. These are called frontier orbitals. Now use these frontier orbitals as your basis set for producing LGO's for B2H6. Since the BH2 frontier orbitals become the LGOS, you will have to think about what is in the middle of the molecule and treat its basis as well. Do you arrive at the same qualitative MO diagram as is discussed in the book? Sketch the new highest occupied and lowest unoccupied MOs for the molecule (B2H6).

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