An atom is the smallest thing discovered it contains electrons (which has a negative charge) neutrons (which has no charge) and protons (which has a positive charge).
An element is a substance which only contains one atom e.g gold only contains one atom which is gold atom. But all elements have different properties like copper is a soft beady metal and oxygen is a colour-less gas. All the elements on the left hand side of the periodic table are metals while elements on the right side of the periodic table are none metals.
Mendeleev created the periodic table. The vertical columns are are called groups and the horizontal rows are called periods, all groups have different proprieties like group 1. has all shiny metals that react with water.



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