BREAKTHROUGH was when the structure of the atom was discovered
When first released, many thought of the periodic table as unimportant as there was little evidence
When newly discovered elements fit into gaps Mendeleev had left, this provided convincing evidence.
Many more scientists saw that table was useful for predicting elements' properties - it really worked
LATE 19TH CENTURY - Structure of atom discovered and matched up well with periodic table
Periodic table is now accepted by scientists as very important and useful summary of atomic structure
MODERN PERIODIC TABLE is based on electronic structure - arranged in order of atomic (proton) number
- Can be used to find the detailed arrangement of electrons in an atom of any element - with this you can…