How many atoms of iodine are represented by the formula below? 3Na2H3IO6 A. 1 B. 3 C. 6 D. 18

The chemical formula of a compound represents the types and number of atoms bonded to form one molecule of the compound. The numbers mentioned as suffix indicate the number of atoms of an element present in one molecule of the compound. The formula 3Na2H3IO6 represent 3 molecules of the compound with formula Na2H3IO6. 1 molecule of the compound contains 2 atoms of sodium, 3 atoms of hydrogen, 1 atom of iodine and 6 atoms of oxygen. Therefore, in 3Na2H3IO6, there are 6 atoms of sodium, 9 atoms of hydrogen, 3 atoms of iodine and 18 atoms of oxygen.

(Answer) (B) 3.