The number of protons in an uncharged atom equals the number of electrons.
Answer: The law of conservation of mass is reffering to the fact that energy cannot be created or destroyed. So when you speak about atoms not being created or destroyed it is the same thing. Unless you're talking about an atomic bomb where the atoms are split.
Too many to know in the world.
Answer:
<h2>The answer is 4.0 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula

From the question
mass = 40 g
volume = 10 mL
The density of the object is

We have the final answer as
<h3>4.0 g/mL</h3>
Hope this helps you