Here's a Valentine's Day -thened activity which consists of 16 questions. Students will determine the mass number, atomic number, the number of protons, neutrons, and electrons in atoms and ions. It is a great revision tool for independent work or whole class instruction. Correct answers will turn green and incorrect answers will turn red. The activity is self-grading; NO PREP on your part. The format is Google Sheets and an editable PDF. An answer key is included.