Question: how many protons and electrons are there in the iodide ion?
Answer: Negative ions are known as anions and have more electrons than protons. I (iodine) atoms (atomic number 53) have 53 protons and 53 electrons. I– (iodide) ions have 53 protons and 54 electrons. The composition of the nucleus for both cations and anions is the same as the corresponding atom.