Question

Find strontium, phosphorus, and oxygen on the periodic table, and then answer the questions below.
• How many valence electrons do each of these elements have?
• Based on the number of valence electrons, indicate the monatomic ion (symbol with charge) each element will form.
• Phosphorus and oxygen can covalently bond to form a polyatomic ion. Write the formula of a polyatomic ion that phosphorus and oxygen make. Make sure to include the ion charge.
• Using the monatomic ions you listed above in (b), the polyatomic ion from (c), and what you have learned in the unit, write the formulas for the three ionic compounds these ions could form.

Answer 1

a.  Valence electrons:

Strontium(S) : 2

Phosphporus (P) : 3

Oxygen (O) : 2

b.   Ions:

Sr⁺²         as sr has 2 valence electrons so it will donate ith 2 e⁻ and get a +2 charge

O⁻² as o will gain 2 e⁻

P⁻³ as p will gain 3 electrons (e⁻)

c.  PO₄⁻³ phosphate ion

Ionic compounds : SrO , Sr₃P₂ . only 2 ionic compounds will be formed