Presentations | Discussion | Card Games | Answer Key | Resource Links Presentations Nanokids English Presentation Nanokids Spanish Presentation Discussion Coming Soon Card Games Download the Nanokids Periodic Table Cards Download the Nanokids Trading Cards Download the Nanokids Cards Box Version 1 Download the Nanokids Cards Box Version 2  Resource Links YouTube Video  If you have a video, please upload it to your YouTube account and tag it "Nanokids" Answer Key c. the number of protons a. TRUE c. oxygen and hydrogen a. TRUE b. one type of atom. Carbon, Hydrogen, Oxygen b. ionic and covalent d. (a) and (c). d. Mountains a. anything that takes up space.