Periodic Table Timeline Miranda, Dan, Felipe and Ricardo

Periodic table TIMELINE

Subtítle here

02

01

greek classification

John Dalton

03

1916

Prout's hypothesis

classification based on valency

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05

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antoine lavoisier

Reasons for rejection

1864

1817

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newlands' octaves

dobereiner's triads

1913

1869

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henry moseley

dmitri mendeleiev

More traits to classify elements

1.- MErits and demerits of the long form of the periodic table2.- atomic radius 3.- metallic and on-metallic characters 4.- summary/notworthy points

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mendeleevs periodic table

• Mendeleev Classification

1869 The periodic table of elements was published — 63 elements known — 8 Vertical column called “groups' labeled in roman numbers — 7 Horizontal rows called “periods, classified in arabic numbers. — Two subgroups “A” and “B” - There were some gaps left for future discoveries — There also were some mistakes with the placement of some elements

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Metallic and Non-Metallic Characters

- Metals main characteristic is their capacity to lose electrons, this is known as Metallic Character and it increases when the elements are located in rows below and on the left side of the periodic table- Non-metals main characteristic is their capacity to gain electrons, this is known as Non-Metallic Character and it increases when the elements are located in rows above and on the right side of the periodic table

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Names of subgroups

Moseley's Modifications (1913)

- Based on a X-ray experiment.- Periodic Law: Elements are now organized based on their atomic number (Z), which is the number of protons and is more accurate than atomic mass (A), number of protons and neutrons. - It evolved to the Long Form of the Periodic Table

Mistakes removed from other classifications

- Position of isotopes: Isotopes don't require separated positions since they are the same element.- Anomalous pairs of elements: All elements' positions are justified.

Subgroups

- Periods: They are seven horizontal rows which denote the highest level of energy of an element.- Groups: They are 18 columns based in valence electrons which are classified into A, B and 0