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An ion is an atom that has gained or lost electrons, making it charged. So, the correct answer is (D) atom.
Solución
- An ion is defined as an atom or molecule that has gained or lost one or more electrons, which gives it a net electric charge.
- A proton is a positively charged subatomic particle, but by itself it is not considered an ion.
- A nucleus is the central part of an atom and does not include electrons; it is not defined as an ion.
- An isotope is an atom with the same number of protons but a different number of neutrons; the term does not refer to its charge.
Thus, the correct answer is
.
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Bonus Knowledge
Ions are fascinating entities in the world of chemistry! They form when atoms gain or lose electrons, leading to a charge. For instance, if a sodium atom loses an electron, it becomes a positively charged sodium ion (Na⁺). This concept is vital for understand how substances interact in solution and helps explain the behavior of various compounds, especially in electrolytes and batteries.
In the real world, ions play crucial roles in many applications. From powering our smartphones through lithium-ion batteries to helping our nerves transmit signals in our bodies, ions are essential actors in both everyday life and scientific advancements. Understanding ions and their properties can open the door to careers in fields like medicine, environmental science, and materials engineering!

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