Work Step by Step
The number of valence electrons for an atom is determined by referring its group number. Arsenic is located in Group 5A, so it has five valence electrons. So (a) is the correct answer.
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.