Chem 132: 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?

Question:

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?

Select one:
a. Rb, 52 neutrons
b. Sr, 51 neutrons
c. Kr, 53 neutrons
d. Kr, 55 neutrons
e. Se, 55 neutrons

Answer

b. Sr, 51 neutrons

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