Exam-Atomic Structure

1. What is the significance of the periodic table?

• a. It lists all the different metals known to humans.
• b. It predicts and lists all the chemical elements in the universe.
• c. It helped the scientific community worldwide.

2. What do electrons in the same shell have in common?

• a. They have the same amount of energy.
• b. They are all positively charged.
• c. They are made up of atoms.

3. Which of the following is an example of a subatomic particle?

• a. carbon
• b. oxygen
• c. electron

4. What might happen if the strong force didn't exist?

• a. Electrons would have positive charges.
• b. Atomic nuclei would fly apart.
• c. It would be difficult to split atoms.

5. What two types of particles exist within an atomic nucleus?

• a. protons and neutrons
• b. neutrons and electrons
• c. protons and neutrinos

6. Oxygen has an atomic number of 8. What can you conclude from this fact?

• a. An atom of oxygen weighs 8 grams.
• b. An atom of oxygen has 8 protons.
• c. An atom of oxygen has 8 positrons.

7. The word "atom" comes from a Greek word for "indivisible." In what way are atoms indivisible?

• a. They cannot be separated once they have bonded with other atoms.
• b. They cannot be broken apart without losing their chemical properties
• c. They are difficult to understand.

8. How are molecules different from atoms?

• a. They consist of several atoms bonded together.
• b. They do not contain neutrons.
• c. They do not have nuclei.

9. What can you conclude from the fact that electrons orbit far away from atomic nuclei?

• a. Electrons are extremely small.
• b. Atoms are comprised mostly of empty space.
• c. Protons have a positive charge.

10. What does the number 6.938 at the bottom of an atom on a periodic table represent(see below)?

• a. atomic number
• b. number of electrons
• c. atomic mass