An element's most stable ion forms an ionic compound with iodine having the formula, XI\({}{2}\). If the ion of element X has a mass of 89 amu and has 36 electrons, which of the following correctly matches the identity of the element and how many neutrons it has?

W) Strontium and 51

X) Krypton and 55

Y) Selenium and 55

Z) Krypton and 53
W) STRONTIUM AND 51