To determine which two elements from the list would bond together based on their ionic charges, we need to look at their positions in the periodic table and their typical ionic charges.
- Potassium (K) is in group IA, which means it has a +1 charge when it forms an ion (K⁺).
- Calcium (Ca) is in group IIA, which means it has a +2 charge when it forms an ion (Ca²⁺).
- Iodine (I) is in group VIIA, which typically forms an ion with a -1 charge (I⁻).
- Neon (Ne) is a noble gas and does not typically form ions, so it does not bond ionically.
Now, looking at the possible pairs mentioned in the options:
A: Potassium and iodine - K⁺ (from potassium) and I⁻ (from iodine) can bond ionically, completing the respective charges (+1 and -1). B: Potassium and neon - Neon does not form ions, so they would not bond. C: Calcium and neon - Similarly, neon does not form ions, so they would not bond. D: Calcium and potassium - While both are cations (Ca²⁺ and K⁺), they would not bond ionically as both are positively charged.
Thus, the answer is:
A: potassium and iodine.
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