How are the elements in the periodic table arranged from left to right and top to bottom based on what value?

Well, elements are arranged based on a number of factors.

Left to right, elements are arranged based on atomic number. The atomic numbers of the elements are increasing by 1 as you move from left to right.

Top to bottom is based on increasing atomic radius. As you move from top to bottom, each succeeding element in a group gets an additional electron shell, increasing the atomic radius as you move down.

Must be negative.substance increases