How does the atomic arrangement of atoms lead to its crystal structure like was seen in the sample of bronze and gold and timber atoms?

In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. Atomic arrangement of atoms in this kind of structure usually very symmetrical and highly ordered. Causing the component within the structure is so strong and hard to break. A crystal 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. Crystal structure would be commonly found in solid compounds.

Answer trigonal pyramidal;

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.