How do the positions of elements in the periodic table help you to predict its chemical properties ? Explain with and example .

Explanation

1 ) The physical and chemical properties of atoms of the elements depend on their electronic configuration , particulary the outer shell configurations.
2 ) Elements are placed in the periodic table according to the increasing order of their electronic configuration .
3) The elements in a group possess similar electronic configurations Therefore all the elements in a group should have similar chemical properties
Ex : Consider K
1 ) it is the element in `4 ^(th) ` period `1^(st ) ` Group .
2 ) Electron configuration : `1s ^(2) 2p ^(6) 3s ^(2) 3p ^(6) 4s ^(1) `
3 ) Differentiating electron enters into s - orbital .Hence it belongs to s - block .
4 ) It is on the left side of the periodic table . hence it is a metal
5 ) It is ready to lose one electron to get octet configuration ,Hence its reactivity is more .
6 ) It is Alkali metal .
7 ) All alkali metals react with both acids and bases and releases `H_(2) ` gas .