An ion, X2–, has a 2– charge. The number of electrons in the ion is 10 and the number of neutrons is 8. Identify the element from which the ion was formed.
Question
An ion, X2–, has a 2– charge. The number of electrons in the ion is 10 and the number of neutrons is 8. Identify the element from which the ion was formed.
Solution
The element from which the ion was formed can be identified by determining the number of protons in the atom.
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The charge of an ion is determined by the difference between the number of protons and the number of electrons. In this case, the ion has a 2- charge, which means it has 2 more electrons than protons.
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Since the ion has 10 electrons, it must have 8 protons (because 10 electrons - 2 = 8 protons).
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The number of protons in an atom determines the atomic number, and thus the identity of the element. An atom with 8 protons is an atom of oxygen.
Therefore, the element from which the ion was formed is oxygen.
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