C2.2.9 - Developing The Periodic Table Flashcards
What was Mendeleev’s arrangement?
It was an attempt to organise elements into a table
What did mendeleev’s arrangement contain?
The atomic weights of known elements
Knowledge of the chemical reactions of different elements
Knowledge of physical properties, such as melting / boiling points
How did Mendeleev arrange elements in his table?
By increasing atomic weight and grouping the elements with similar chemical properties
What did Mendeleev predict?
That elements with similar chemical reactions would be discovered, so he left spaces for them in his graph
What was the issue with mendeleev’s table?
He did not know about protons and atomic structure
When did Mendeleev die?
1907
Who discovered that an atom’s atomic number was the number of protons?
Henry Moseley
When did Henry Moseley discover that the amount of protons were equal to an atom’s atomic number?
1913
