#29:
The oxygen with the different mass numbers is more similar than the copper metal and the copper ions. Since the oxygens are isotopes it doesn't affect their reactivity, while the difference between the metal and its ions affects every aspect of the substances.
#30:
205 pm
#31:
a. Bromine
b. Silicon
#32:
Cobalt and nickel would switch places and so would argon and potassium.
#33:
Magnesium protects the metal hull from corroding.
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