Where does “isoelectric” come from?

I need to trace the etymology of "isoelectric" through the given chain, but I notice the chain provided (English electric → Ancient Greek σθένος → Latin -icus → Proto-Indo-European -kos) doesn't actually form a coherent path for "isoelectric." The chain seems incomplete or incorrectly ordered. "Isoelectric" would be composed of "iso-" (from Greek "isos" meaning equal) + "electric" (from Greek "ēlektron"). The provided chain shows a suffix progression but doesn't include the necessary Greek roots. However, following your instruction to "state only what the chain supports" and not invent steps: I cannot write an accurate one-sentence etymology because the provided chain does not adequately support the formation of "isoelectric." Could you provide the correct etymological chain for this word? It should likely include Greek roots for both "iso-" and

isoelectric (English): Having equal electric potential, or the same...