Ionic Compounds and Their Properties

The video tutorial explains how to write the Lewis structure for potassium iodide (KI). It begins by identifying potassium as a metal and iodine as a nonmetal, forming an ionic compound. The tutorial details the transfer of valence electrons from potassium to iodine, resulting in a positive charge on potassium and a negative charge on iodine. This charge transfer leads to the formation of an ionic bond. The video also discusses the use of brackets in the Lewis structure to indicate electron transfer and introduces the concept of formula units in ionic compounds.

What type of compound is formed when a metal and a nonmetal combine?

• Molecular compound

• Metallic compound

• Ionic compound

• Covalent compound

How many valence electrons does potassium have?

• One

• Two

• Seven

• Eight

In which group of the periodic table is iodine found?

• Group 1

• Group 2

• Group 17

• Group 18

What happens to potassium when it loses an electron?

• It remains neutral

• It gains a proton

• It becomes positively charged

• It becomes negatively charged

What is the charge on iodine after it gains an electron?

• Double positive

• Negative

• Neutral

• Positive

What type of attraction holds the ions together in an ionic bond?

• Nuclear attraction

• Gravitational attraction

• Electrostatic attraction

• Magnetic attraction

Why are brackets used in the Lewis structure of ionic compounds?

• To indicate the number of atoms

• To highlight the central atom

• To represent transferred electrons

• To show shared electrons

What is a formula unit in the context of ionic compounds?

• An isolated ion

• A covalent bond

• A repeating unit in a crystal

• A single molecule

How are ionic compounds typically structured?

• As individual molecules

• As amorphous solids

• In a gaseous state

• In a crystalline pattern