Ionic Compounds and Their Properties

The video tutorial explains how to write the Lewis structure for sodium iodide (NaI). It begins by identifying sodium as a metal and iodine as a non-metal, forming an ionic compound. Sodium has one valence electron, while iodine has seven. In ionic compounds, the metal transfers its valence electron to the non-metal. Sodium transfers its electron to iodine, resulting in a positive sodium ion and a negative iodine ion, which form an ionic bond. The video also explains the use of brackets in the Lewis structure to indicate the transfer of electrons and describes the concept of a formula unit in ionic compounds.

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

• Ionic compound

• Molecular compound

• Covalent compound

• Metallic compound

How many valence electrons does sodium have?

• One

• Two

• Eight

• Seven

In which group is iodine found on the periodic table?

• Group 1

• Group 2

• Group 17

• Group 18

What happens to sodium when it loses its valence electron?

• It becomes positively charged

• It gains an electron

• It becomes negatively charged

• It remains neutral

What charge does iodine acquire after gaining an electron?

• Positive

• Neutral

• Negative

• Double negative

What is the purpose of using brackets in the Lewis structure of ionic compounds?

• To show shared electrons

• To indicate the number of atoms

• To represent the charge of ions

• To highlight the central atom

What is the main characteristic of an ionic bond?

• Sharing of electrons

• Transfer of electrons

• Formation of molecules

• Weak attraction between atoms

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

• An isolated atom

• A covalent bond

• A repeating unit in a crystal

• A single molecule

What is the repeating pattern in ionic compounds called?

• Metallic bond

• Covalent network

• Crystal lattice

• Molecular structure