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An element forms an ionic compound with bromine having the formula XBr. If the mass number of the element X is 41 and the ion has 18 electrons, what is the element X and how many neutrons does it have?
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An element forms an ionic compound with bromine having the formula XBr. If the mass number of the element X is 41 and the ion has 18 electrons, what is the element X and how many neutrons does it have?

User GettingStarted
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Answer:

X is calcium and it has 21 neutrons

Step-by-step explanation:

Calcium 41 is an isotope of calcium with mass number of 41 and atomic number of 20

Number of neutrons = mass number - number of electrons

The number of electrons is the same as the atomic number of the element (calcium)

Number of neutrons = 41 - 20 = 21

User Daniel Grezo
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