Based on your line graph and the elements you chose to graph, do you see any kind of relation between the boiling and melting point of the element with the atomic number or atomic mass of that element?
lithium has a boiling point of 1590 and a melting point of 453.69. its atomic number is 3 and the atomic mass is 6.941.
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Well the boiling point of an element is usually higher than that of it's melting point counterpart for one. The similarity begins when you go from right to left on the period of elements. There's an decrease and then an increase. So reactivity effects the physical traits of the element, being your similarity between the boiling and melting points :D

Cuz i said so. which gives it to b