The Handbook of Chemistry and Physics lists the density of a certain liquid to be 0.7988 g/mL. Taylor experimentally finds this liquid to have a density of 0.7925 g/mL. What is his percent error?

Explanation:

The percentage error of a certain measurement can be found by using the formula

From the question

actual density = 0.7988 g/mL

error = 0.7988 - 0.7925 = 0.0063

So we have

We have the final answer as

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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.