1. Fill in the timeline to identify some important moments in the history of the development of the periodic table
Scientists used the periodic table to:
Chemists had
described almost
The number of
known elements
elements.
is
Mid-1800s
Early 1900s
Today
2. Complete the sentence.
Elements with similar
are located near one another in clusters in the periodic table.
3. Fill in the chart to identify three pieces of information given in each square of the periodic table.