Question

_____♥____
D & f block Notes from NCERT.

Provide me pic from ur Notebook.

No Spmming
@BeardoBoy
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Answer 1

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Look in the attachment form (21) to (40) for element name , element symbol and the atomic number.

Explanation

Element name Element symbol Atomic

number ( 1 ) to ( 21 )

Hydrogen (H) 1

Helium (He) 2

Lithium (Li) 3

Beryllium (Be) 4

Boron (B) 5

Carbon (C ) 6

Nitrogen (N) 7

Oxygen (O) 8

Fluorine (F) 9

Neon (N) 10

Sodium (Na) 11

Magnesium (Mg) 12

Aluminium (Al) 13

Silicon (Si) 14

Phosphorus (P) 15

Sulfur (S) 16

Chlorine (Cl) 17

Argon (Ar) 18

Potassium (K) 19

Calcium (Ca) 20

Answer 2

Answer:

The d-block of the Periodic Table contains the elements of the groups 3-12 in which the d·orbitals are progressively filled. There are mainly three series of the elements, 3d-series (Sc to Zn) 4d-series (Y to Cd) and 5d-series (La to Hg omitting Ce to Lu). The fourth 6d-series which begins with Ac is still incomplete.