Which of the following are molecules? (Select all that apply.) MgCl2

K

H2

Mg

What effect does nuclear radiation have on atoms?

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

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.