What are d block elements?
The elements which have half-filled d subshells in their highly stable oxidation state or ground state are d block elements. They are also known as transition elements. The number of electrons in all the transition elements is similar.
d block elements electronic configuration
There exists three series of elements that rely on the n-1 d orbital that will be filled. The lower energy orbital will fill first. Hence 4s orbital is filled first and then the 3d orbital which has higher energy is filled. The electronic configuration of first series is denoted as 1s22s2p6 3s2p6d1-10 4s2
The electronic configuration of second series is denoted as 1s22s2p6 3s2p6d1-10 4s2p6d1-10 5s2
The electronic configuration of third series is denoted as 1s22s2p6 3s2p6d1-10 4s2p6d1-10 5s2p6d1-10 6s2
Properties of d block elements
- All d block elements are metals.
- The atomic size of d block elements is smaller than s block elements from Scandium to Zinc and as the nuclear charge increases, atomic size decreases.
- The I.P. values are intermediate between of s block and p block elements. Therefore d block elements are more electropositive when compared to p block elements but less reactive when compared to s block elements. They have the ability to form covalent as well as ionic compounds.
- Excluding zinc, the boiling and melting point of all transition elements is very high.
- It has small atomic radii with greater interatomic forces of attraction. They are very hard.
- d block elements are good conductors of heat as well as electricity.
- Excluding zinc, all other d block elements are colorless as a result of unpaired electrons.
d block elements names
|Element name||Symbol||Atomic number|
|Darmstadium||Ds or Uun||110|
There are various learning Apps which help you with online (eLearning) courses such as BYJU’S which is the largest k-12 learning App in India. It includes Biology, maths, physics, and other courses which also offers chemistry course like – Actinides.
To understand the concepts in a better way, subscribe to BYJU’S YouTube channel