What are first inner transition elements?

1.	What are first inner transition elements?
Answer» 1. 4f - block elements are called (first) inner transition elements and have partly filled inner orbitaIs or (4f) orbitais. 2. They have general outer electronic configuration (n-2)f^1-14, (n-1)d^0-1,ns². 3. There are two f-series, namely 4f and 5f series, called lanthanoids and acùnoids respectively. 4. They shos intermediate properties as compared to electropositive s-block elements and electronegative p-block elements. Hence they are called (first) inner transition elements.

Answer»

1. 4f - block elements are called (first) inner transition elements and have partly filled inner orbitaIs or (4f) orbitais.

2. They have general outer electronic configuration

(n-2)f^1-14, (n-1)d^0-1,ns².

3. There are two f-series, namely 4f and 5f series, called lanthanoids and acùnoids respectively.

4. They shos intermediate properties as compared to electropositive s-block elements and electronegative p-block elements.

Hence they are called (first) inner transition elements.

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