Use the list to answer the question.

Question

⚫ potassium, Group IA
•
calcium, Group IIA
• iodine, Group VIIA
•
• neon, Group VIIIA
Which two elements in the list would bond together based on their ionic charges?
(1 point)
calcium and potassium
potassium and neon
potassium and iodine
calcium and neon

Answer 1

To determine which two elements would bond together based on their ionic charges, we need to consider the groups they are in:

• Potassium (K) is in Group IA and has a charge of +1 (it loses one electron).
• Calcium (Ca) is in Group IIA and has a charge of +2 (it loses two electrons).
• Iodine (I) is in Group VIIA and has a charge of -1 (it gains one electron).
• Neon (Ne) is in Group VIIIA and is a noble gas, so it does not readily form bonds.

For elements to bond ionically, a positively charged ion (cation) needs to bond with a negatively charged ion (anion).

The best pairing based on ionic charges would be:

• Potassium (+1) and Iodine (-1)

This means that potassium and iodine would bond together to form potassium iodide (KI).

Therefore, the correct answer is potassium and iodine.