Question

use the list to answer the 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
○ calcium and neon
○ potassium and neon
○ potassium and iodine

Explanation:

1. Determine ionic charges:

• Group IA (like potassium, K) has a +1 charge (loses 1 electron).
• Group IIA (calcium, Ca) has a +2 charge (loses 2 electrons).
• Group VIIA (iodine, I) has a -1 charge (gains 1 electron).
• Group VIIIA (neon, Ne) is a noble gas, stable, doesn’t form ions easily.

1. Ionic bonding needs a metal (loses e⁻, positive ion) and non - metal (gains e⁻, negative ion) with charges that balance.

• Potassium (+1) and iodine (-1) can form an ionic bond (K⁺ and I⁻, ratio 1:1, neutral compound KI).
• Calcium and potassium: both metals (positive ions), can’t bond ionically.
• Calcium and neon: neon is noble gas, no ionic bonding.
• Potassium and neon: neon is noble gas, no ionic bonding.

Answer:

D. potassium and iodine