History of the Periodic Table

jadepalmer98
Mind Map by jadepalmer98, updated more than 1 year ago
jadepalmer98
Created by jadepalmer98 over 6 years ago
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GCSE Chemistry (C3) Mind Map on History of the Periodic Table, created by jadepalmer98 on 10/29/2013.
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Resource summary

History of the Periodic Table
1 In the early 1800s they could only use atomic mass
1.1 Categorisation through
1.1.1 Physical and chemical properties
1.1.2 Relative atomic mass
1.1.3 No idea of atomic structure or protons/electrons

Annotations:

  • No such thing as atomic number - only in C21st after protons and electrons were discovered that it was realised that elements were best arranged in order of atomic number
1.2 Could only measure relative atomic mass - known elements arranged in order of atomic mass
2 Newlands' law of Octaves was the first good effort
2.1 Had the first good method of arranging in 1964

Annotations:

  • Noticed that every eighth element had similar properties, so listed some of the known elements in rows of sevens
2.1.1 The sets of eight were called Newlands' Octaves

Annotations:

  • Unfortunately the pattern broke down on the third row - transition metals (Titanium Ti and Iron Fe) messed it up. He left no gaps so his work was ignored, but he was getting quite close
2.2 Criticised because...
2.2.1 Groups contained elements that didn't have similar properties - eg. carbon and titanium
2.2.2 Mixed up metals and non-metals - eg. oxygen and iron
2.2.3 Didn't leave gaps for elements that haven't been discovered yet
3 Dmitri Mendeleev left gaps and predicted new elements
3.1 In 1869, Mendeleev from Russia had 50 known elements and arranged them with various gaps
3.2 Put his elements into order of atomic mass, but left gaps to keep elements with similar properties in the same vertical groups
3.3 The gaps were the clever bit as they predicted the properties of undiscovered elements - eventually found and fitted the pattern
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