Chemistery

You've met ions — atoms with a charge. They come in exactly two flavours: cations and anions . The names sound almost identical, which is exactly why students mix them up on exams. Let's lock in the difference for good. The short answer: a cation is a positively charged ion (an atom that lost electrons). An anion is a negatively charged ion (an atom that gained electrons). Cation = positive, anion = negative. Quick comparison at a glance Feature Cation Anion Charge Positive (+) Negative (−) How it forms Loses electrons Gains electrons Protons vs electrons More protons than electrons More electrons than protons Usually formed by Metals (+ NH₄⁺, H⁺) Nonmetals Size vs the original atom Smaller than the atom Larger than the atom Moves toward (in electrolysis) The cathode (−) The anode (+) Examples Na⁺, Mg²⁺, Ca²⁺, NH₄⁺ Cl⁻, O²⁻, OH⁻, SO₄²⁻ Everything below is just these rows explained — including a couple of tricks so you ...

A sodium atom is a soft metal that explodes in water. A sodium ion is half of ordinary table salt — completely harmless. Same element, one tiny change. That change is what makes an ion , and it's behind salts, batteries, and the signals firing in your nerves right now. The short answer: an ion is an atom (or group of atoms) that has gained or lost one or more electrons , giving it an overall electric charge. Lose electrons → positive ion. Gain electrons → negative ion. What an ion actually is Remember that a neutral atom has equal numbers of protons (+) and electrons (−), so the charges cancel. An ion forms when that balance is broken — but only the electrons move. The protons never change. That last point matters: because the proton count stays the same, it's still the same element . A sodium ion is still sodium; it has just lost an electron and picked up a charge. Lose electrons → fewer negatives than positives → a positive ion (a cation ). Gain electrons → more...