The Periodic Table Notes
Progression of Elements
By 1650, 11 Elements were known
- Ag, As, Au, C, Cu, Fe, Hg, Pb, S, Sb, Sn
By 1800, about 30 elements were known
By 1850, about 60 elements were known
By 1900, about 80 elements were known
By 1950, about 90 elements were known
History of the Periodic Table
Dmitri Mendeleev (1800’s) — Russian Chemist
- Developed the 1st periodic table
Found Patters
- Organized elements by their properties + Mass #’s
Predicted Unknowns
- Left blank spaces for unknown elements
- Predicted the properties + mass #’s of unknown elements
Henry Mosley (1913) — English Chemist
- Organized the elements by their properties and atomic #’s
Periodic Law
Periodic Law – the repeating chemicals and physical properties of elements change
Periodically with the atomic #.
Elements in the same group have similar properties.
Basic Structure of the Periodic Table
o Elements arranged in an order of increasing atomic
o 7 rows called periods
o 18 columns called groups or families
o Plus, lanthanides and actinides
Progression of Elements
By 1650, 11 Elements were known
- Ag, As, Au, C, Cu, Fe, Hg, Pb, S, Sb, Sn
By 1800, about 30 elements were known
By 1850, about 60 elements were known
By 1900, about 80 elements were known
By 1950, about 90 elements were known
History of the Periodic Table
Dmitri Mendeleev (1800’s) — Russian Chemist
- Developed the 1st periodic table
Found Patters
- Organized elements by their properties + Mass #’s
Predicted Unknowns
- Left blank spaces for unknown elements
- Predicted the properties + mass #’s of unknown elements
Henry Mosley (1913) — English Chemist
- Organized the elements by their properties and atomic #’s
Periodic Law
Periodic Law – the repeating chemicals and physical properties of elements change
Periodically with the atomic #.
Elements in the same group have similar properties.
Basic Structure of the Periodic Table
o Elements arranged in an order of increasing atomic
o 7 rows called periods
o 18 columns called groups or families
o Plus, lanthanides and actinides
