Matter Exam Question 2

The video tutorial explains the structure of a nitrogen atom, including its nucleus, protons, neutrons, and electrons. It guides students through labeling a diagram and understanding the charges of different particles. The tutorial also covers calculating the mass number of an atom by adding protons and neutrons. Finally, it discusses the electronic structure of an oxygen atom, helping students identify the correct diagram based on the atomic number and electron distribution.

What is the charge of a proton?

• Neutral

• Positive

• Negative

• No charge

How is the mass number of an atom determined?

• By adding the number of electrons and protons

• By adding the number of protons and neutrons

• By counting the number of shells

• By subtracting the number of electrons from protons

In a nitrogen atom, how many protons are present?

• 7

• 5

• 6

• 8

Which diagram correctly represents the electronic structure of an oxygen atom?

• Diagram D with 10 electrons

• Diagram A with 4 electrons in the first shell

• Diagram B with 2 electrons in the first shell and 6 in the second

• Diagram C with 6 electrons

How many electrons can the first shell of an atom hold?

• 2

• 6

• 4

• 8