The most common element in the universe is
Hi Grace , and Welcome to the Canvas Community!
While the very easy answer to your question is "hydrogen", something that can easily be Googled, you have asked your question in the global Canvas Community where users from all over the world come to talk about all things Canvas, and make use of various Canvas-related resources. As such, we do not have access to individual courses other than our own, and a great many of us would not be able to answer most curriculum-specific questions. In other words, you got lucky that I was the first responder to your question.
You will need to ask your teacher these kinds of questions, but please feel free to come visit us any time you have a Canvas question. If you do not know how to contact your teacher using Canvas, you can learn more at How do I send a message to a user in a course in Conversations as a student?
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