THE PERIODIC TABLE OF ELEMENTS CHEMICAL ELEMENTS
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
117 CHEMICAL ELEMENTS KNOW TO MAN 92 FOUND NATURALLY THE OTHERS MADE BY SCIENTISTS IN A LABORATORY
1869 Dmitry Mendelev created The Periodic Table of Elements Organised table of all the known elements, ordering by the ATOMIC NUMBER
GROUPS PERIODS
GROUPS ELEMENTS WITH SIMILAR ELECTRON CHARACTERISTICS ELEMENTS WITH SIMILAR REACTIVE PROPERTIES