Question

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How to calculate group number of elements belonging to s-block , p-block , d-block and f-block ?

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Answer 1

Answer:-

Bohr's Electronic Configuration:-

• 2 , 8 , 8 , 18 , 18 , 32 , 32.

Aufbau Principal:-

• "s" ( shape) = 1 - 2
• "p" ( Principle) = 1 - 6
• "D" ( Diffusion) = 1 - 10
• "F" ( Fundamental) = 1 - 14

Let's take an Example:-

Nitrogen ( N = 7) :- 1S² , 2S² 2p³.

Here, 2p³

Number of shell = 2

Block Number = P

Calculating group number of elements belonging to s-block , p-block , d-block and f-block.

• For s-block :- Group Number is equal to the Number of Valence Electrons.
• For p- block :- Group Number is equal to the Valence Electron + 10 if the Valence Electron is greater than 2.
• For d-block :- Group Number is equal to the sum of No. of Valence Electrons to the sunshell electron.

• Let also study about the "Theory of Energy".

Aufbau represent the Theory of Energy in ( n + l) group where n = Orbital Number.

Value Of "l" for every block:-

• s = 0
• p = 1
• d = 2
• f = 3
• g = 4

Note :-

When any two elements represent the same energy then the lowest Orbital Number shows lower Energy.

Ex:- 4S² , 3d8 , 7p6 , 4f² , 7s² , 7f¹⁴

4S² = ( 4 + 0 ) = 4

3d8 = ( 3 + 2) = 5

7p6 = ( 7 + 1) = 8

4f² = ( 4 + 3) = 7

7S² = ( 7 + 0 ) = 7

7F¹⁴ = ( 7 + 3) = 10

So, According to Aufbau Theory of Energy. It will be;

4S² , 3d8 , 4f² , 7s² , 7p6 , 7f¹⁴.

Answer 2

Explanation:

The blocks refer to the highest energy orbitals the valence electrons for each element are in. There are two groups in the s block as you can either have one or two electrons in an s orbital. There are six groups in the p block as you can have up to six electrons in the three p orbitals.