1. THE PERIODIC TABLE OF ELEMENTS
CHEMICAL ELEMENTS

2. MATTER MADE OF ATOMS OF THE SAME TYPE MADE OF ATOMS OF DIFFERENT TYPE
CHEMICAL ELEMENTS
MADE OF ATOMS OF THE SAME TYPE
MADE OF ATOMS OF DIFFERENT TYPE
CHEMICAL COMPOUNDS

3. 117 CHEMICAL ELEMENTS KNOW TO MAN
92 FOUND NATURALLY
THE OTHERS MADE
BY SCIENTISTS
IN A LABORATORY

5. 1869 Dmitry Mendelev created The Periodic Table of Elements
Organised table of all the known elements, ordering by the ATOMIC NUMBER

6. GROUPS
PERIODS

7. GROUPS ELEMENTS WITH SIMILAR ELECTRON CHARACTERISTICS
ELEMENTS WITH SIMILAR REACTIVE PROPERTIES