Answer:
The answer to your question is:
Explanation:
Which formulas are incorrect:
NaO₂    Incorrect           Na₂O   correct
RbCl     Correct
Kâ‚‚S Â Â Â Â Â Correct
Al₂Cl₃    Incorrect           AlCl₃    correct
MgP₂    Incorrect          Mg₃P₂   correct