Astronomers used to think that the universe was made up of <span>baryonic matter.
Now, astronomers say its made up of atoms, dark matter, and mostly dark energy. hope that helps!</span>
Answer:
D.The average speed of the hydrogen molecules is the same as the average speed of the oxygen molecules.
Explanation:
Answer:
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Mass number is the mass number of that particular Element found in the periodic table and the atomic number is the atomic no. Again found in the periodic table