The graduation of the metallic and nonmetallic property in the modern periodic table
Modern periodic table
Then the nonmetallic property appears , and increases by increasing the atomic number till we reach the strongest nonmetal ( in group 17 ( 7 A ) and ends in the inert gas ( group zero ) .
By increasing the atomic number ( within a period ) , the metallic property decreases , while the nonmetallic property increases .
When you look within group ( 1 A ) in the modern periodic table , You will notice the graduation of the metallic property , Cesium ( Cs ) is the most metallic element in group ( 1 A ) , and lithium ( Li ) is the least metallic element in group ( 1 A ) .
In nonmetallic groups , the nonmetallic property decreases gradually as we go from top to bottom as in group ( 7 A ) ( due to the decrease of the electronegativity ) .
When you look within group 7 A ( 17) in the modern periodic table , You will notice the graduation of nonmetallic property , Flourine ( F ) is the strongest nonmetal element in group ( 7 A ) . and Iodine ( I ) is the least nonmetal element in group ( 7 A ) .
When you look at the modern periodic table , you notice that there is a direct relationship between the atomic size of an element , and its metallic property .
There is a direct relationship between the electronegativity of an element , and its nonmetallic property .