1. Please use the periodic table located below to help you formulate your answers. On the table, locate
the elements barium, phosphorus, and oxygen and then answer the questions below.
List the number of valence electrons each element has and explain how you know. Barium: 2, Phosphorus:
5, Oxygen: 6
b) Based on the number of valence electrons, write the monatomic lon (symbol with charge) each element may
form.
c) Phosphorus and oxygen can bond to form a polyatomic ion. Write the formula of for this lon and be sure to
include the ion charge.
d) Using the monatomic ions you listed above in (b), the polyatomic ion from (c), write the formulas for the
three ionic compounds these ions could form.
