Tagged: Non-metals

The modern periodic table 0

The description of the modern periodic table

Modern periodic table The modern periodic table consists of 7 horizontal periods and 16 vertical groups ( 18 vertical columns ) . The elements of the modern periodic table are classified into 4 blocks...

Non-metals 0

The chemical properties of the non-metals

Non-metals The non-metals are the elements which have more than four electrons in their outermost energy levels , The non-metals are characterized by the smallest atomic sizes and the largest electronegativity .