Given credit for the modern periodic table

Arranged elements by increasing atomic mass

Grouped element with similar properties in vertical rows

Left empty space for properties not yet found and predicted thier properties 

Did experiments to find the number of protons in each element

Called the number of protons the atomic number 

Rearranged elements on the periodic table by atomic number

The physical and chemical properties of the elements are periodic functions of thier atomic number

When elements are arranged in order of increasing atomic number elements with similar properties appear at regular intervals