How many energy levels does an atom of beryllium have?

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

Volume is a measurement of how fast particles of a substance are moving