2. Who?
• Dmitri Mendeleev created/
started the periodic table.
• Mendeleev was a Russian
chemist and inventor.
• Using the table, he predicted
the properties of elements
yet to be discovered.
3. How?
• Mendeleev organized the elements by their
atomic numbers.
• The Periodic Table is like a grid.
• It is organized by Periods (left to right) and
Groups/Families (top to bottom).
4. Organization
All the rows in a period go left to right. As
elements progress through a period, they
gain protons.
The columns in a group go from top to
bottom. The elements in a group all exhibit
similar chemical characteristics.
5. Neon
• Atomic Number: 10
• Element symbol: Ne
• Atomic Mass: 20.180
6. Lithium
• Atomic Number: 3
• Element symbol: Li
• Atomic Mass: 6.941
7. Calcium
• Atomic Number: 20
• Element symbol: Ca
• Atomic Mass: 40.078
