Why This Stuff Costs $2700 Trillion Per Gram - Antimatter at CERN

Quick question:
If a matter, let's say of an atom of Oxigen, if you successfully create an Anti-matter of Oxigen's atom and mix with Hydrogen atoms, would that eliminate electrons and protons from the hydrogen or would you need an atom with higher electron and proton quantity, let's say, mix the Oxigen's Anti-matter atoms with Sulfur atoms, do you eliminate 8 electrons and protons and create oxigen?

Guess we'll have to wait and see xD