Periodic Table of Elements

He grouped the elements in threes (with similar properties) and found that the atomic mass of the middle element is the average of the other two.

• Johann Wolfgang Dobereiner

• John Newland

• Dmitri Mendeleev

• Henry Moseley

• Glenn Seaborg

He arranged elements into groups of simple substances that would not decompose by any means.

• Johann Wolfgang Dobereiner

• Antoine Lavoisier

• Dmitri Mendeleev

• Henry Moseley

• Glenn Seaborg

Tags

NGSS.MS-PS1-1

He noted that the properties of the 8th element would be similar to the properties of the first element in the period. He called this pattern as the law of octaves.

• Johann Wolfgang Dobereiner

• John Newland

• Dmitri Mendeleev

• Henry Moseley

• Glenn Seaborg

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

He arranged the elements in increasing atomic mass.

His periodic table originally consisted of 17 columns. 1871, he revised it into 8 columns with the transition metal occupying the 8th column. His work was widely accepted because he predicted the existence and properties of undiscovered elements that were later found.

• Johann Wolfgang Dobereiner

• John Newland

• Dmitri Mendeleev

• Henry Moseley

• Glenn Seaborg

The modern periodic table is based on his work. The periodic law shows that there is a periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number.

• Johann Wolfgang Dobereiner

• John Newland

• Dmitri Mendeleev

• Henry Moseley

• Glenn Seaborg

He discovered the trans-uranium element with atomic number 92-102. He added the lanthanide and actinide series projected perpendicular to the plane of the periodic table.

• Johann Wolfgang Dobereiner

• John Newland

• Dmitri Mendeleev

• Henry Moseley

• Glenn Seaborg

In the periodic table of elements, the vertical columns are called _______

__________ are the horizontal rows which are designated as 1,2,3,4,5,6, and 7 in the periodic table

It is a tabular arrangement of the elements based on increasing atomic number.

• Map of the Elements

• Periodic Table of the Elements

The Father of the Periodic Table of Elements. He is considered to be the most important contributor to the development of the periodic table. His version of the periodic table organized elements into rows according to their atomic mass and into columns based on chemical and physical properties.

• Henry Moseley

• John Newlands

• Johann Debereiner

• Dmitri Mendeleev