Question
How is an ion different from an atom? How is cation different from anion?
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Answer
| BASIS FOR COMPARISON | CATION | ANION |
|---|---|---|
| Meaning | An atom or molecule having more number of protons than electrons and are positively charged is called cation. | An atom or molecule having more number of electrons than protons and are negatively charged is called anion. |
| Charge | These are positively charged. | These are negatively charged. |
| Formed of | Cation are formed from metal atoms. | Anion are formed from non-metals atoms. |
| Compounds formed | Cation combine with the anions to form the ionic bonds. | Anion combine with the cations to form the ionic bonds. |
| Electrolysis | Cation always move towards the cathode, which produces the negative charge. | Anion always move towards the anode, which produces the positive charge. |
| Examples | Iron (Fe2+), Sodium (Na+), Lead (Pb2+). | Fluoride (F-), Bromide (Br-), Iodide (I-), Nitride (N3-) and Hydride (H-). |
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