A compound is a substance made up of atoms of two or more different elements joined by chemical bonds. A mixture is a combination of two or more substances that are not chemically combined.
Answer:
<h3>The answer is 3.0 g/mL</h3>
Explanation:
The density of a substance can be found by using the formula

From the question
mass = 15 g
volume = 5 mL
We have

We have the final answer as
<h3>3.0 g/mL</h3>
Hope this helps you
Answer for your question is;
2,6 = 8
The first shell is 2 electrons the other shell is 6 electrons