Formal Charge and Valence Electrons

The video tutorial explains how to calculate the formal charge for each atom in the ammonium ion (NH4+). It begins by examining the Lewis structure, noting that each hydrogen atom is satisfied with two valence electrons, and the nitrogen atom has an octet. The tutorial then calculates the formal charge for hydrogen, showing it to be zero, and for nitrogen, showing it to be +1. This aligns with the overall positive charge of the ammonium ion, indicating the positive charge is on the nitrogen atom.

What is the first step in calculating the formal charge of an atom in a molecule?

• Subtract the number of bonded electrons.

• Identify the number of valence electrons.

• Determine the molecular geometry.

• Count the total number of atoms.

How many valence electrons does a hydrogen atom have?

• Four

• One

• Three

• Two

What is the formal charge of a hydrogen atom in the ammonium ion?

• +2

• -1

• 0

• +1

In which group is nitrogen found on the periodic table?

• Group 1

• Group 5

• Group 15

• Group 17

How many valence electrons does nitrogen have?

• Five

• Nine

• Three

• Seven

What is the formal charge of the nitrogen atom in the ammonium ion?

• +2

• +1

• -1

• 0

Why does the ammonium ion have an overall positive charge?

• Due to the negative charge on the nitrogen atom.

• Because it has more electrons than protons.

• Because of the positive charge on the nitrogen atom.

• Due to the positive charge on hydrogen atoms.

What does the positive charge on the nitrogen atom indicate?

• It is neutral.

• It has lost an electron.

• It has gained an electron.

• It has gained a proton.

What is the significance of the formal charge in a molecule?

• It shows the boiling point of the molecule.

• It indicates the color of the molecule.

• It helps in predicting the stability of the molecule.

• It determines the molecular weight.

What is the overall charge of the ammonium ion?

• +2

• +1

• 0

• -1