English Chemist) arranged elements by atomic number.

14 elements were known

He found three other groups with similarities. He called these groups

wrote the first extensive list of 33 elements

English Chemist) arranged the now known 62 elements from lightest to heaviest.

At the same time, he published his own table of the elements organized by increasing atomic mass.

(German Chemist) noticed that Br, Cl, and I had similar properties and that Br's atomic mass was between that of Cl & I.

Russian Chemist) organized the elements by atomic mass also but made it into table form to help his students.

Arangged elements by atomic mass

He found three other groups with similarities. He called these groups triads

4 elements

Discovered 8 new elements

He also noticed that every 8th element had similar chemica and physical properties. Their properties were repeating. This became known as Newland's Law of Octaves.

First person to notice the periodicity of the elements

spiral on a cylinder by order of increasing atomic weight

Arangged the elements to lightest to heaviest

This gave rise to the Periodic Law, "Properties of elements are periodic functions of their atomic mass."

aranged elements by atomic number

He also noticed that every 8th element had similar chemica and physical properties. Their properties were repeating. This became known as _

Considered the Father of the Modern Period Table!

Only living person for whom an element was named.