An element x has two naturally occurring isotopes: x-79 (abundance+50.69%, mass +78.918amu) and x-81 (abundance+49.31% mass+80.917amu). calculate the weighted atomic mass of x. also, identify the unknown element which exists as a reddish brown gas and is a liquid at room tempature

What element breaks down into yttrium-90?

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4.0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.