## What are inner-transition elements?

The basic concepts of inner-transition elements is this that, the last electron in the f-block element enter into (n-2) orbitals and they form a transition series within the transition series (d-block). this is called inner-transition elements.

it mean, inner-transition elements (f- block elements) including 4f series (lanthanoids, Z = 58 to 71) and 5f series actinoids (z= 90 to 103). these elements have incomplete f-block in penultimate shell of their atoms.

There are two different series of inner-transition elements.

1. First, 4f series (lanthanoids – Z = 58……to …… 71).
2. Second, 5f series (Actinoids – Z = 90 ….to…….103).

Now, we will discuss about 4f series and 5f series.

lets know with examples,

In f-block elements, start with ce and end with ln, this series is known as 4f series (lanthanoids).

whereas,

In f-block elements, start with Up and end with Lr, this series is known as 5f series (Actinoids).

According to this, the position of all elements persent in d-block elements. but this series, including, lanthanoids (ce to ln) and Actinoids (Up to Lr), elements are persent in d-block.

therefore, we can say that, d-block elements is known as transition elements whereas, f-block elements is know as inner-transition elements.

### What are d- block?

If the last electron of an elements inter to (n-1)d orbitals. then this is consider as a d – block elements?

SC (21) [Ar] 4s2 3d1

Ti (22) [Ar] 4s2 3d2

ns (n-1) d – when the last electron of an elements inter to (n-1) d this is known as d – block elements.

### What are position of d- block?

The main position of d – block is given below.

1. Between s – block and p – block.
2. Group 3 to 12.
3. Period 4 to 7.

### What is transition elements?

Incomplete d – orbitals, this is know as a transition elements.

For examples,

1. SC (21)
2. Ti (22)
3. V (23)
4. Cr (24)
5. Mn (25)
6. Fe (26)
7. CO (27)
8. Ni (28)
9. Cu (29)

All are incomplete d – orbitals, this is called transition elements.

but zn (zinc) is not transition elements. Because

Zn (30) – [Ar] 4s2 3d10.

Due to this electron configuration of zn. We can say that,

### What is diffrence between transition elements and inner transition elements?

1. Transition elements – If last electrons inter in d – orbitals is know as transition elements.

For examples,

Sc, Ti, V, Cr Mn, Fe, Co, Ni etc.

Electron configuration,

Sc – 4s2 3d1

Ti – 4s2 3d2

and show one, it mean last electrons inter in d – orbitals. so, you can say that, these all are transition elements.

2. Inner transition elements – If Last elements inter in f – block orbitals is know as inner transition elements.

for examples,

1. Lanthenoids
2. Actinoids

### Inner transition elements properties?

1. Transition elements are pure matel.
2. Transition elements is good conductive.

### Transition elements which block?

If last elements inter in d- block is known as transition elements.

The last elements occur in d – orbitals. these elements is known as transition elements. d – orbitals occur in between s- block and f-block. But if last elements inter Or occur in f- block is know as inner transition elements. but in case of d-block only (Zn) zinc is not transition elements.

There are 8 to 9 different elements is given below, these all elements occur in d-block.

for examples,

D- block elements

Sc – 4s2 3d1

Ti – 4s2 3d2

V – 4s2 3d3

Cr – 4s2 3d4

Mn – 4s2 3d5

Fe – 4s2 3d6

Co – 4s2 3d7

Ni – 4s2 3d8

Cu – 4s2 3d9

All elements are transition elements and occur in d-block. these types of elements is known as transition elements.

But Zn (zinc) – 4s2 3d10 , this is the reson only zinc is not transition elements.

zinc is not called transition elements.