The way to write ionic formulas is e.g. pottasium nitride, pottasium is a metal and nitride is another word for nitrogen making it a non-metal. Before we do this formula we will need the periodic. So here’s a pic of the periodic table.
What is an atom? Have you tried too learn about atoms but found the information too hard to understand well, this info will be perfect for you, thats why keep on reading to understand these mysterious particles.
The foundations of science 