Page 2 - LN 3

 d-Block elements :
The elements whose last electron enters to the d-subshell of
penultimate energy level are

called d-block elements.
0-2
 General electronic configuration : ns (n-1)d 1-10
It is situated between s-block and p-block and having 40
elements which are divided in to 4 series. i.e.,3d, 4d, 5d and

6d series.
 General characteristics of d-block elements :

They are hard, malleable and ductile.
They have high melting and boiling points.

They are good conductors of heat and electricity.

 F-Block elements :

The elements whose last electron enters to the f-subshell of

antipenultimate energy level are called f-block elements.
General electronic configuration :
0-1
2
(n-2) f 1-14 (n-1)d ns
It is present below s, p, and d block elememts.

It has 28 elements which are divided in to 2 series.
(i)Atomic number 58-71-Lanthanoid series

(ii)Atomic number 90-103-Actinoid series.
All these are known as inner transition elements.
General characteristics :

They are hard metals.
They have high melting and boiling points.

They show variable oxidation state.
Their compound are generally coloured.

They have high tendency to form complex.
Most of them are radioactive in nature.

The elements after uranium are called Transuranium Elements.
Prediction of period, group and block of an element :
 Write down electronic configuration of the element.

 The period of the element corresponds to the principal
quantum number of the valence shell.