2. The volume of a rock is 5 cm' and its mass is 50 g. Find the density.
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Explanation:

The density of a substance can be found by using the formula

From the question we have

We have the final answer as

Hope this helps you

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.