Barium and Lewis Structures

The video tutorial explains how to draw the Lewis structure for the barium ion (Ba2+). It begins with an overview of barium's electron configuration, highlighting its 56 electrons and two valence electrons available for bonding. The tutorial then demonstrates how to draw the Lewis structure for barium, showing the placement of valence electrons. It further explains the formation of the barium ion, where barium loses two electrons to become Ba2+, and how to represent this in a Lewis structure with brackets to indicate its ionic nature. The video concludes with a reminder of the full electron shell beneath the removed valence shell, which is conventionally not shown.

What is the main focus of this video?

• Drawing the Lewis structure for Ba2+

• Studying atomic theory

• Understanding the periodic table

• Learning about chemical reactions

How many electrons does barium have in total?

• 56

• 57

• 55

• 54

In which group is barium found on the periodic table?

• Group 3

• Group 2

• Group 1

• Group 4

How many valence electrons does barium have?

• 3

• 2

• 1

• 4

What is the correct way to represent barium's valence electrons in a Lewis structure?

• Place them next to the element symbol

• Place them inside the element symbol

• Place them below the element symbol

• Place them above the element symbol

What happens to barium's electrons when it forms a Ba2+ ion?

• It loses two electrons

• It gains one electron

• It gains two electrons

• It loses one electron

What charge does barium have after losing two electrons?

• 2-

• 1-

• 2+

• 1+

Why are brackets used in the Lewis structure for Ba2+?

• To indicate it is a molecule

• To show it is an ion

• To denote the atomic number

• To highlight the valence electrons

What is not shown in the Lewis structure for Ba2+ by convention?

• The atomic number

• The element symbol

• The full outer shell

• The full inner shell

Who is the presenter of the video?

• Dr. A

• Dr. B

• Dr. D

• Dr. C