So,
We want to draw a graph of the melting and boiling points of the elements of the periodic table against the atomic number of each of them.
For this, remember that the metals have properties that makes them have a greater melting and boiling points.
Let me upload the graph here below:
As you can see, the melting temperature of the first six atomic numbers is increasing until we finish in 7. It depends of the characteristic of the element.
If you look at your periodic table, the graph will be something like I posted above.