Explanation:
Tollens' reagent is prepared by using two-step process : -
Step 1:
Silver oxide is formed by mixing aqueous silver nitrate with base like sodium hydroxide. The reaction is shown below as:

Step 2
Ammonia solution is drop-wise added until all the silver oxide dissolves to form the reagent. The reaction is shown below as:

Write the symbols for the cation and the anion: Mg and Cl. Determine the charge on the cation and anion. If the cation has a Roman numeral after it, that is the charge on that cation. Cations receive Roman numerals when they can take more than one ionicform.
periodical table and write caculatoin numbers
Rocks charcoal and sand could help
The major groups of minerals includes: carbonate ions and oxides, . In addition to this three groups the following are also the major groups of minerals
native elements
sulfate
sulfides
halides
silicate
nitrate among others such as phosphate and vanadate