Dmitri Mendeleev Periodic Table

1. The Development of the Periodic
Table
The Legacy of Dmitri Mendeleev
Presented by: [Your Name]

2. Why the Periodic Table Matters
• - Organizes elements based on properties
• - Essential tool in chemistry
• - Predicts behavior of elements

3. Before Mendeleev
• - Scientists tried organizing elements by
atomic mass
• - Dobereiner’s Triads (1817)
• - Newlands’ Law of Octaves (1864)
• - Lacked flexibility and accuracy

4. Meet Dmitri Mendeleev
• - Russian chemist and teacher
• - Born in 1834, Siberia
• - Passionate about chemistry and patterns in
elements

5. The Breakthrough
• - 1869: Created the first Periodic Table
• - Arranged elements by atomic mass
• - Noticed patterns in chemical properties
• - Left gaps for undiscovered elements

6. Mendeleev's Predictions
• - Predicted properties of unknown elements
• - Example: Gallium, Germanium, Scandium
• - Later discoveries confirmed his predictions

7. Why It Was Revolutionary
• - Logical classification
• - Allowed for future discoveries
• - Emphasized properties over strict atomic
mass order

8. Then and Now
• - Modern table is based on atomic number
• - Built on Mendeleev’s foundation
• - Arranged in periods and groups

9. His Lasting Impact
• - Considered the 'Father of the Periodic Table'
• - Element 101 named Mendelevium (Md)
• - Inspired generations of chemists

10. Summary
• - Mendeleev transformed how we understand
elements
• - His method was scientific, predictive, and
practical
• - His work remains foundational in chemistry
today