What is the Law of Triads?

Certain groups of three showed similar chemical and physical properties which if the elements in any triad were arranged in increasing relative, the relative atomic mass of the middle element was close to the avg. of the first and third element.

In what yr did Henry Moseley placed the elements in increasing atomic number and what this resulted in.

In 1914,he placed the elements in increasing atomic number which resulted in all elements with similar properties falling into the same groups.

In 1869, who published the Periodic Classification of Elements?

In 1869, Dmitri Mendeleev published his Periodic Classification of Elements.

The Law of Octaves was proposed by whom, and what is it exactly?

It was proposed by John Newlands, it’s the arrangement of the elements in order of increasing relative atomic mass and that each elements eight places ahead of it exhibited similar chemical and physical properties.Similar elements in vertical columns, gro

Moving along any period from left to right has what?

Each element has one more valence electron than the element directly before it.

Moving along any period from left to right does what to the nature?

The metallic nature of the elements decreases and the non-metallic nature increases.

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Periodicity

Question	Answer
What did Johann Dobereiner proposed / discovered?	He proposed the Law of Triads
What is the Law of Triads?	Certain groups of three showed similar chemical and physical properties which if the elements in any triad were arranged in increasing relative, the relative atomic mass of the middle element was close to the avg. of the first and third element.
In what yr did Henry Moseley placed the elements in increasing atomic number and what this resulted in.	In 1914,he placed the elements in increasing atomic number which resulted in all elements with similar properties falling into the same groups.
In 1869, who published the Periodic Classification of Elements?	In 1869, Dmitri Mendeleev published his Periodic Classification of Elements.
The Law of Octaves was proposed by whom, and what is it exactly?	It was proposed by John Newlands, it’s the arrangement of the elements in order of increasing relative atomic mass and that each elements eight places ahead of it exhibited similar chemical and physical properties.Similar elements in vertical columns, gro
Moving along any period from left to right has what?	Each element has one more valence electron than the element directly before it.
Moving along any period from left to right does what to the nature?	The metallic nature of the elements decreases and the non-metallic nature increases.

Created by: Yi yi

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