LECTURE 3 (The Structure of Crystalline Solids)

Question 1

Principle of electronic configuration

Answer 1

electron fill the lowest energy subshell first before moving to the next subshell.
Each atomic orbital can accomodate max of 2 electrons with opposite spin
Most stable arrangement of electrons is that with the maximum no of unpaired elecctrons ,all with the same spin directions

Question 2

Primary Interatomic Bonds

Answer 2

Three types of primary bonds: ionic, covalent, metallic
* For each type, the bonding necessarily involves the valence electrons; the
nature of bond depends on electron structure of the atoms
* Atoms are more stable with full outermost electron shell (like inert gases)
and will give or take electrons to get there.

Question 3

Main Differences between the primary interatomic Bonds

Answer 3

Ionic ;has electrostatic attraction between oppositely charged ions
Covalent:there is electron sharing between adjacent atoms such that each atom assumes a stable electron configuration
metallic ;the positively charged ion cores are shielded from one another and also glued together by the sea of valence elctrons

Question 4

objectives of lecture

Answer 4

Understand the structure of
crystalline solids and predict the
theory density of materials.
b) Be able to index crystallographic
direction and plane and calculate
the related density.

these show up in the exams and are so important