Answer the following question:
  
State the number of atoms present in each of the following chemical species:
 
i. Number of atoms present \(CO_3^{2-}\) is .
ii. Number of atoms present \(PO_4^{3-}\) is .
iii. Number of atoms present \(P_2O_5\) is .
iv. Number of atoms present \(CO\) is .