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

question 62

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 number of 89 and 36 electrons,what is the identity of the element X,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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