History of the Periodic Table (AQA GCSE Chemistry Combined Science): Flashcards
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Scientist who grouped elements into 'triads'
Scientist who grouped elements into 'triads'
Johann Döbereiner
What were 'triads' in early element classification?
What were 'triads' in early element classification?
Groups of elements with similar properties
Who created first widely recognised Periodic Table?
Who created first widely recognised Periodic Table?
Dmitri Mendeleev
Year Mendeleev created his Periodic Table
Year Mendeleev created his Periodic Table
1869
How did Mendeleev arrange elements in his table?
How did Mendeleev arrange elements in his table?
By increasing atomic mass, grouping similar properties together
Why did Mendeleev leave gaps in his table?
Why did Mendeleev leave gaps in his table?
For undiscovered elements
What did Mendeleev predict with accuracy?
What did Mendeleev predict with accuracy?
Properties of undiscovered elements
How are elements arranged in modern Periodic Table?
How are elements arranged in modern Periodic Table?
By increasing atomic number
What is atomic number?
What is atomic number?
Number of protons
What did atomic number arrangement resolve?
What did atomic number arrangement resolve?
Inconsistencies from atomic mass arrangement
How does Periodic Table help predict properties?
How does Periodic Table help predict properties?
Predicts properties of new elements and their compounds