Review I Constants I Periodic Table

What is the magic number? $($Figure $2)$

Note that there is a figure also associated with this part. However, the figure for Part A may still be visible on the left. To view the figure associated with Part B$,$ click on the figure link. A new figure should appear on the left.

You could try to guess the magic number but you would probably use up all your tries before getting the answer. Notice the new Hints button above the answer box for this question. Clicking this button will open up a list of hints that will guide you to the correct number.

Express your answer as an integer.

View Available Hint$($s$)$

Hint $1.$ Different types of hints and their impact on grading

Hint $2.$ How to approach the problem

Hint $3.$ What is $x?$

Magic number $=$