Outer Transition Elements(d-block Elements)||Inner transition Elements (f-block Elements)

Outer Transition Elements(d-block Elements)||Inner transition Elements (f-block elements)
**Outer Transition Elements (d-block)** and **Inner Transition Elements (f-block)**, as typically required in chemistry exams or notes.

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## Outer Transition Elements (d-block Elements)

**Definition:**
Elements in which the **last electron enters the (n–1)d subshell**.

**Position in Periodic Table:**

* Groups **3 to 12**
* Located **between s-block and p-block**

**Examples:**
Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn

**General Electronic Configuration:**
[(n–1)d¹–¹⁰ ns¹–²]

**Key Characteristics:**

* Variable **oxidation states**
* Formation of **coloured compounds**
* Show **paramagnetism**
* Good **catalytic properties**
* High **melting and boiling points**
* Form **complex compounds**

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## Inner Transition Elements (f-block Elements)

**Definition:**
Elements in which the **last electron enters the (n–2)f subshell**.

**Position in Periodic Table:**

* Shown **separately at the bottom**
* Two series:

* **Lanthanides (4f)** → La–Lu
* **Actinides (5f)** → Ac–Lr

**Examples:**
Ce, Nd, Eu (Lanthanides)
U, Th, Pu (Actinides)

**General Electronic Configuration:**
[(n–2)f¹–¹⁴ (n–1)d⁰–¹ ns²]

**Key Characteristics:**

* Predominantly **+3 oxidation state**
* Mostly **paramagnetic**
* Form **coloured ions**
* Many actinides are **radioactive**
* Less tendency to form complexes than d-block elements

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## Differences Between d-block and f-block Elements

| Feature | d-block (Outer Transition) | f-block (Inner Transition) |
| ----------------- | --------------------------- | -------------------------- |
| Subshell filled | (n–1)d | (n–2)f |
| Location | Main body of periodic table | Bottom separate rows |
| Oxidation states | Variable | Mostly +3 |
| Radioactivity | Generally non-radioactive | Many are radioactive |
| Complex formation | Strong tendency | Weaker tendency |
| Industrial use | Catalysts, alloys | Nuclear fuels, magnets |

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