Question

An atom of the element ____________has an average atomic mass of about 16 amu.

Answer 1

The answer is oxygen because the atomic mass (amu) of oxygen is 15.999

Answer 2

The answer is oxygen, because it has an atomic mass of ~16 amu.

When you have a question like this, the easiest thing to do is just pull up a picture of the periodic table!

Hope this helps you!