What Ionic Formulas are Possible when looking at the Periodic Table ?
Answer
Not all elements will combine with each other. When looking at the Periodic Table, some possible Ionic Compounds can form. We look at the charges and overall charge balance of the compound and determine the Formula. Reference sheets attached.
Examples. 1] Nickel (II) has a 2+ charge, and Sulfide has a 2- charge. The compound must be NiS
with charges balanced.
2] Potassium has a 1+ charge, and Oxide has a 2- charge. The compound must be K(2)O
with charges balanced.
3] Hydrogen has a 1+ charge, and Cyanide has a 1- charge. The compound must be HCN,
which is hydrogen cyanide or cyanic acid.