An Element's Most Stable Ion Forms an Ionic Compound with Chlorine

question 13

Multiple Choice

An element's most stable ion forms an ionic compound with chlorine having the formula XCl₂. If the ion of element X has a mass of 89 and 36 electrons, what is the identity of the element, and how many neutrons does it have?

• A) Kr, 53 neutrons
• B) Kr, 55 neutrons
• C) Se, 55 neutrons
• D) Sr, 51 neutrons
• E) Rb, 52 neutrons

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