Question

The group of elements in which the differentiating electron enters the antepenultimate shell of atom are called
A.F-block elements B. p-block elements
C. S-block elements D. d-block elements ​

Answer 1

Answer:

the group of elements in which the differentiating electrons enter the antepenultimate shell of an atom is called f block elements.

f block elements are also known as inner transition elements.

(n − 2)f 1 − 14(n − 1)d0 − 1ns1 − 2. this is the general electronic configuration of f block element.

f blocks are classified into 2 groups that are  

• lanthanoids  
• actinoids

lanthinoids  = this is a lanthanoid series which comes after element lanthium

it is a 4f series  

starting element is lanthenium ( 57)  

Lanthanum:  57

Cerium: , 58

Praseodymium: ,  59

Neodymium:  60

Promethium: ,  61

Samarium:  62

Europium:  63

Gadolinium: 64

Terbium:r 65

Dysprosium: 66

Holmium: 67

Erbium: 68

Thulium: 69

Ytterbium: 70

Lutetium:71

actinoids =  this is an actinoids series which start from element actinides atomic number (89)

it is a 5f series    

(n–2)f 1–14(n–1)d0–10 ns1-2

this is a general configuration of actinides.