See explanation below.
Work Step by Step
a. Bromine-79,7A,4 b.Phosphorus-31, 5A,3 c.Rubidium -85,1A,5 This answer can be found the chapter 2 reading.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.