The atomic number defines the number of protons in an atom.
Answer:
The pennies are NOT made of pure copper since the obtained density is 9.29 g/cm3 which is greater than the density of copper which is 8.96 g/cm3.
Explanation:
True, because a liquid can be taken and added, but a solid stay the same never losses and never gains
<span>Heat would make the molecules move faster so they would spread out therefore making air less dense.
Less dense means less packed. Heat increase the kinetic energy</span>
Fission energy is gained by splitting apart heavy atoms fusion is combining light atoms
