Development of the periodic table (AQA GCSE Chemistry Combined Science): Flashcards
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Scientist who made breakthrough with periodic table in 1800s
Scientist who made breakthrough with periodic table in 1800s
Mendeleev
Two things scientists knew about elements in 1800s
Two things scientists knew about elements in 1800s
Properties of elements and atomic weights
Subatomic particles scientists didn't know about in 1800s
Subatomic particles scientists didn't know about in 1800s
Protons, neutrons and electrons
How first periodic table ordered elements
How first periodic table ordered elements
By atomic weight
Example of different elements mixed in same column (early table)
Example of different elements mixed in same column (early table)
Oxygen and iron
Year Mendeleev published his periodic table
Year Mendeleev published his periodic table
1869
What Mendeleev left in his table for future discoveries
What Mendeleev left in his table for future discoveries
Gaps for undiscovered elements
Why Mendeleev swapped some elements' order
Why Mendeleev swapped some elements' order
Properties fitted better than atomic weight order
Example of elements Mendeleev swapped despite atomic weight
Example of elements Mendeleev swapped despite atomic weight
Iodine and tellurium
What Mendeleev predicted about missing elements
What Mendeleev predicted about missing elements
Their properties (which later came true)
Why table is called 'periodic'
Why table is called 'periodic'
Properties repeat at regular intervals
What proved Mendeleev's approach was correct
What proved Mendeleev's approach was correct
His predictions for missing elements came true