EXPLAIN WRITING CHEMICAL FORMULAS IN THE ATOMS AND MOLECULES CHAPTER IN AN EASY WAY
Remember specific names:
1. Fe+2 is called Ferrous, and Fe+3 is known as Ferric.
2. Cu+1 is referred as Cuprous and Cu+2 as Cupric.
You must know valency of elements to write proper chemical formula.
You can refer Slides no. 27-28-29-30 in below link: