Valence Electrons and Lewis Structures

The video tutorial explains how to draw the Lewis structure for iodine tribromide (IBr3). It begins by counting the valence electrons of iodine and bromine, totaling 28 electrons. Iodine is placed at the center with three bromines around it. Electron pairs are added to form bonds, and bromines' octets are completed. The remaining electrons are placed around iodine, which can have an expanded octet, allowing it to hold more than eight electrons. The video concludes with a complete Lewis structure for IBr3.

How many valence electrons does iodine have in the IBr3 molecule?

• 5

• 8

• 6

• 7

What is the total number of valence electrons in the IBr3 molecule?

• 21

• 42

• 35

• 28

Where is iodine placed in the Lewis structure of IBr3?

• At the top

• At the bottom

• At the center

• On the side

How many valence electrons are initially used to form bonds in IBr3?

• 18

• 28

• 12

• 24

What is the maximum number of valence electrons iodine can have in an expanded octet?

• 8

• 10

• 12

• 14

How many valence electrons does each bromine atom have in the completed structure?

• 8

• 7

• 9

• 6

Why is it acceptable for iodine to have more than eight valence electrons in IBr3?

• Because it is in period 3 or below

• Because it is a halogen

• Because it is a metal

• Because it is a noble gas