Question

Sodium metal is quiet soft whereas sodium chloride crystals are quiet hard explain why

Answer 1

In mineralogy and crystallography, a crystal structureis a unique arrangement of atoms in a crystal. Acrystal structure is composed of a unit cell, a set of atoms arranged in a particular way; which is periodically repeated in three dimensions on a lattice.
Crystals create a harder more fitting structure so they tend to be a lot stronger than other compounds or elements