Valence Electrons and Lewis Structures

The video tutorial explains the NH2- Lewis structure, starting with the count of valence electrons for nitrogen and hydrogen. It describes placing nitrogen in the center with hydrogens on the outside, forming chemical bonds, and ensuring the octet rule is satisfied. The tutorial concludes with the notation for ions, including brackets and a negative sign.

How many total valence electrons are there in the NH2- Lewis structure?

• 6

• 7

• 8

• 9

Where is nitrogen placed in the NH2- Lewis structure?

• In the center

• Next to one hydrogen

• On the outside

• Above the hydrogens

How many valence electrons are used to form chemical bonds between atoms in NH2-?

• 4

• 8

• 6

• 2

What is the significance of completing the octet for nitrogen in NH2-?

• It ensures nitrogen has a full outer shell.

• It allows hydrogen to bond with nitrogen.

• It reduces the total number of electrons.

• It changes the charge of the ion.

Why are brackets and a negative sign added to the NH2- Lewis structure?

• To balance the equation

• To show it is an ion

• To indicate it is a molecule

• To highlight the central atom