Elements are arranged in ascending order of their atomic number and according to their electronic configurations, the sequence of elements agrees with the Auf-bau principle, The long-form periodic table is classified into 4 blocks which...
Some of representative elements groups are known as regular groups, Because their elements show a great regularity & graduation in their properties and that is not found in the transition elements, One of the...
The chemical properties & some of the physical properties of the elements depend on their electronic structure and especially on the valence electrons ( the electrons of the outermost level ) , The concept...
