Question

1 . Define the following terms :
(a) Octet rule
(b) Lattice Enthalpy
(c) Bond length. ​

Answer 1

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a) The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

b) The lattice energy of a crystalline solid is a measure of the energy released when ions are combined to make a compound. It is a measure of the cohesive forces that bind ions. Lattice energy is relevant to many practical properties including solubility, hardness, and volatility.

c) In molecular geometry, bond length or bond distance is defined as the average distance between nuclei of two bonded atoms in a molecule. It is a transferable property of a bond between atoms of fixed types, relatively independent of the rest of the molecule.

Answer 2

Answer:

1. It refers to the tendency of atoms to prefer to have 8 electrons in the valence shell .

2. it is a measure of the strength of the force between the ions in an inoic solid

3. the average distance between nuclei of 2 bonded atoms in a molecule.