Final answer:
The atoms that form negative ions in binary ionic compounds are I, Cl, O, O²-, and S²-. The atoms that form positive ions are Mg²+, In³+, Cs⁺, Pb²+, and Co²+.
Step-by-step explanation:
The atoms that would be expected to form negative ions in binary ionic compounds are: I, Cl, O, O²-, and S²-. The atoms that would be expected to form positive ions are: Mg²+, In³+, Cs⁺, Pb²+, and Co²+.