Question

show differences between molecular crystal and metallic crystal​

Answer 1

Answer:

Metallic crystals are also atomic solids, made of metal atoms held together by metallic bonds. ... Because molecular crystals are held together by such weak bonds, their melting points tend to be much lower, they are worse conductors of heat and electricity, and they are softer.

Answer 2

Explanation:

i) The basis of similarities and differences between metallic and ionic crystals are given below:

(a) Similarities: Both ionic and metallic crystals have electrostatic attractive forces. In ionic crystals, the forces are present between oppositely charged ions and in metallic crystals, the forces are between valence electrons and kernels.

Due to this, both crystals have high melting points.Both crystals have non directional bonds.

(b) Differences:

Ionic crystals do not conduct electricity in solid state as ions are not free to move. They conduct electricity in molten state and in aqueous solutions. Molecular crystals conduct electricity in solid state as valence electrons are free to move.

Ionic bond in ionic crystals is strong due to electrostatic attractive forces. However, in metallic crystals, the metallic bond may be weak or strong depending upon the number of valence electrons and the size of the kernels.

(ii) Ionic solids are hard due to presence of strong electrostatic attractive forces among oppositely charged ions. Due to non directional nature of ionic bond, the ionic solids are brittle.