Hi can someone help me plz! I’m behind on this and I don’t understand

Answer:The atoms you need to build are on the right. You need three colors, and need to say what each color is. Each color should represent a different element.
Explanation:
Answer:
The atoms you need to build are on the right . You need three colors and you need to say what the colors are. Each color should represent a different element.
Explanation: