Practice writing the compounds different ions will make when they react. I will give you 2 ions that will react. You need to write the correct formula for the compound that those two ions will create. For example:

When potassium reacts with sulfur

first write the ions for each element

K1+ and S2-

Then write your basic compound formula. Put the positive ion first, then the negative ion

KS

Then use the charge number to determine how many of each atom is required to make a neutral compound like we did in the nearpod video (remember you don't need to write 1s in your formulas)

K2S This formula is complete!

Write the formulas for the following reactions:

When calcium reacts with oxygen

when lithium reacts with sulfur

when caesium reacts with phosphorus

when strontium reacts with iodine