Which one of the following sets of ions represents a collection of isoelectronic species?

(Atomic numbers: F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

Question

Which one of the following sets of ions represents a collection of isoelectronic species?

(Atomic numbers: F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

Canvas Classes · Accepted Answer

🧠 The Periodic Table Scan
The question gives you atomic numbers as clues. We are looking for a set of species where the sum of (Atomic Number - Charge) is constant for all.

🗺️ Testing the Suspects
Let's check Option (d):
- : 
- : 
- : 
- : 
Since all possess 18 electrons (making them isoelectronic with Argon), this is our winner.

⚡ The Group Mismatch Filter
Look at Option (a): . These are all cations, but they belong to different shells.  has 2 electrons, while  has 10. They can't possibly b

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