Valence Electrons and Lewis Structures

Dr. B explains how to draw the Lewis structure for the ammonium ion (NH4+). The video covers calculating the total valence electrons, placing nitrogen and hydrogen atoms, forming bonds, and ensuring the octet rule is satisfied. The final structure is completed by adding brackets and a charge to account for the lost electron.

What is the total number of valence electrons in NH4+?

• 8

• 7

• 9

• 10

Where should Hydrogen atoms be placed in the Lewis structure of NH4+?

• At the center

• Next to Nitrogen

• On the outside

• Inside the structure

How many valence electrons are used to form bonds in NH4+?

• 8

• 6

• 4

• 10

What is the required number of valence electrons for Hydrogen to be stable?

• 2

• 1

• 4

• 8

How many valence electrons does Nitrogen need for a full outer shell?

• 6

• 8

• 4

• 2

What is the purpose of adding brackets around the NH4+ structure?

• To highlight the central atom

• To denote the positive charge

• To show the molecular shape

• To indicate the number of bonds

Why is there a plus sign in the Lewis structure of NH4+?

• Because it is neutral

• Because it has an extra electron

• Because it lost an electron

• Because it gained a proton