Exploring Atoms: Protons, Neutrons, and Electrons

1. Week 3 Warm-ups Skip a page in your CRCT notebook for your week 2 quiz

2. Which of the following is the heaviest? • the electron • the proton • the neutron • the nucleus

3. The nucleus of an atom is • always positively charged. • always negatively charged. • always neutrally charged. • sometimes an ion charge.

4. Neutral lithium has three protons. During a chemical reaction, one electron is removed. How many protons does lithium have now? • 3 • 2 • 1 • You must know what element lithium reacted with to determine this.

5. Which of these is NOT a particle found in an atom? • proton • electron • molecule • neutron

6. What is the name and atomic number for the element represented below? • K, 19 • K, 39.098 • Potassium, 19 • Potassium, 39.098 19 K Potassium 39.098

7. An atom of the element shown below has how many protons? • 18 • 19 • 39 • 58 19 K Potassium 39.098

8. Which of the following is a chemical symbol representing an element? • C • CO • CO2 • H20

9. Which of the following is smaller than a single atom? • Proton • Molecule • Element • solution

10. The elements in the far-right column of the periodic table • are very reactive. • are metalloids. • are metals. • are inert gases.

11. Where are the metalloids in the periodic table? • In the far left column • In the far right column • In the top row • Along the step-like line