An element X forms an ion X²⁺. If the neutral atom of X has 20 electrons, how many electrons are present in the ion?
18
A neutral atom has an equal number of protons and electrons, so element X has 20 electrons and 20 protons.
Formation of the ion X2+ means the atom has lost 2 electrons while the number of protons stays unchanged.
Subtracting the 2 lost electrons from the original 20 electrons gives 20 minus 2 equals 18 electrons remaining in the ion.
Hence, the ion X2+ contains 18 electrons.
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