To determine which two elements would bond together based on their ionic charges, we need to understand the common ionic charges of the elements listed:
- Potassium (K) is in Group IA and typically has a charge of +1.
- Calcium (Ca) is in Group IIA and typically has a charge of +2.
- Iodine (I) is in Group VIIA and typically has a charge of -1.
- Neon (Ne) is in Group VIIIA and is a noble gas, which means it typically does not form bonds.
In ionic bonding, a positively charged ion (cation) will bond with a negatively charged ion (anion) to form a stable compound.
Based on the charges:
- Potassium (+1) can bond with Iodine (-1) to form potassium iodide (KI).
- Calcium (+2) does not have a counterpart in the list that provides a -2 charge, but if paired with iodine, it could still form a bond as calcium can bond with two iodine atoms (CaI2).
- Neon does not typically bond due to its full valence shell.
From the list of pairs provided, the best option that forms a bond based on their ionic charges is:
potassium and iodine.