What do the ions K+, Ca2+, and Cl− have in common?Group of answer choicesThey are larger than their corresponding atoms.They will form covalent bonds with oxygen.They have the same electron configuration as argon.They have the same number of protons.

The ions K+, Ca2+, and Cl− have the same electron configuration as argon.

Here's why:

1. K+ (Potassium ion): The atomic number of potassium is 19. It means it has 19 electrons in its neutral state. When it loses one electron to form K+, it has 18 electrons left. The electron configuration of Argon, which is a noble gas, is also 18.

2. Ca2+ (Calcium ion): The atomic number of calcium is 20. In its neutral state, it has 20 electrons. When it loses two electrons to form Ca2+, it has 18 electrons left. This is the same electron configuration as Argon.

3. Cl− (Chloride ion): The atomic number of chlorine is 17. In its neutral state, it has 17 electrons. When it gains one electron to form Cl−, it has 18 electrons. This is the same electron configuration as Argon.

So, all these ions have the same electron configuration as Argon.