Redraw this structure with three other resonance structures

What element breaks down into yttrium-90?

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?