Periodic table

History of Periodic Table

Some text here about the topic of discussion

Organized the 33 known elements into four groups:

• Metals

• Nonmetals

• Gases

• Earths

​

Antoine Lavoisier (1743–1794)

​

​allowed scientists to break compounds down into simpler elements.

Discovery of Electricity​

​

allowed scientists to identify individual elements.

Invention of Spectrometer​

many chemical industries developed new compounds such as fertilizers and dyes

Industrial Revolution​

Scientists found a method of measuring an elements atomic mass​

​Atomic mass

arranged 14 of the known elements according to increasing atomic mass.

• Newlands discovered that the properties of elements are repeated every eighth element.

• He called this relationship as the law of octaves.

​

​The law of octaves did not apply to all elements

​John Newlands (1837–1898)​

​Arranged the elements in the order of atomic mass.

​

He was the first to show connection between the atomic mass and the properties of elements

​He didn't publish first

​Lother Mayer

-Arranged the elements in the order of atomic mass.

-Showed the connection between atomic mass and properties of elements

-Left empty spaces for undiscovered elements​

-Predicted the properties of undiscovered elements​

​

​He placed some of the elements in the worng position due to unaccuracy of atomic masses.

Dmitri Mendeleev

​

-Said every element has a unique number called atomic number which means the number of protons in an atom.

​-Arranged the elements in the order of atomic number.

-Corrected the errors in Mendeleev's table.

-​Element's properties repeated in a periodic pattern.

​Some text here about the topic of discussion.

​Henry Moseley

States that when elements are arranged in order of atomic number, the properties of elements are repeated at regular intervals

Periodic law

Multiple Choice

Who compared the elements with musical notes and named as law of octaves

• Antonie Levoiser

• J Newlands

• Luther mayer

• D Mendeleev

Multiple Select

Which scientists arranged the elements in the order of atomic mass

• Antonie Levoiser

• J Newlands

• Luther Mayer

• D Mendeleev