The Early Periodic Table

John Dalton: (1765-1844)

Arranged the elements in order of their masses. (Today it is Relative Atomic Mass)

John Newland:

In 1863, suggested the elements were to be arranged in octaves --> Similar to music; the eighth note resembles the first note. Thus, there was a systematic relationship between the order of atomic masses and the repetition of their properties.

His problems:

  • He did not leave spaces- thinking that all the elements had been found.
  • The law was best applied to Calcium but some were too heavy to fit Newland's idea.

Dimitri Mendeleev:

In 1869 he published his table- elements were arranged by increasing atomic mass.

Why he was accepted:

  • Mendeleev had left spaces for elements he knew hadn't been invented yet. However, he predicted their properties and after the discovery of these unknown elements between 1874 and 1885 because Mendeleev was so close to the actual value, thats why he was accepted! Furthermore, because he predicted their properties, he was known as the father of the elements :) x
HideShow resource information
Preview of The Early Periodic Table

First 196 words of the document:

The Early Periodic Table
John Dalton: (1765-1844)
Arranged the elements in order of their masses. (Today it is Relative Atomic
Mass)
John Newland:
In 1863, suggested the elements were to be arranged in octaves --> Similar
to music; the eighth note resembles the first note. Thus, there was a
systematic relationship between the order of atomic masses and the
repetition of their properties.
His problems:
He did not leave spaces- thinking that all the elements had been
found.
The law was best applied to Calcium but some were too heavy to fit
Newland's idea.
Dimitri Mendeleev:
In 1869 he published his table- elements were arranged by increasing atomic
mass.
Why he was accepted:
Mendeleev had left spaces for elements he knew hadn't been invented
yet. However, he predicted their properties and after the discovery
of these unknown elements between 1874 and 1885 because
Mendeleev was so close to the actual value, thats why he was
accepted! Furthermore, because he predicted their properties, he
was known as the father of the elements :) x

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »