When a compound has a Roman Numeral in it, that tells you the 2 points
the positive oxidation number
the subscript of the element before it
the subscript of the element after it
the negative oxidation number
K
the year

70x30

Explanation:

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.