Question: are k and cl isoelectronic?
Answer: Potassium has an atomic number of 19 (Z = 19). ... And we can see that the potassium ion, K+, has the same electronic configuration as the chloride ion, Cl-, and the same electronic configuration as an atom of argon, Ar. Therefore, Ar, Cl-, and K+ are said to be isoelectronic species.