Question

Use the Periodic Table to determine the number of electrons in each of the s, p and d orbitals outside the precious noble gas core of the following elements: (i) Silicon (ii) Chlorine (iii) Manganese (iv) Cobalt

Answer 1

There are total “18 groups” and “seven periods” in the periodic table.

1. Element: Si (Z = 14)

Electronic configuration: $[Ne]{ 3s }^{ 2 }{ 3p }^{ 2 }$

Number of electrons in s-orbital: 2

Number of electrons in p-orbital: 2

Number of electrons in d-orbital: nil

2. Element: Cl (Z = 17)

Electronic configuration: $[Ne]{ 3s }^{ 2 }{ 3p }^{ 5 }$

Number of electrons in s-orbital: 2

Number of electrons in p-orbital: 5

Number of electrons in d-orbital: nil

3. Element: Mn (Z = 25)

Electronic configuration: $[Ar]{ 3d }^{ 5 }{ 4s }^{ 2 }$

Number of electrons in s-orbital: 2

Number of electrons in p-orbital: nil  

Number of electrons in d-orbital: 5

4. Element: Co (Z = 27)

Electronic configuration: $[Ar]{ 3d }^{ 7 }{ 4s }^{ 2 }$

Number of electrons in s-orbital: 2

Number of electrons in p-orbital: nil

Number of electrons in d-orbital: 7

Answer 2

Hey mate....
here is your answer .....☺☺✌☺☺

i) [Ne]3s²3p²

ii) [Ne]3s²3p^5

iii) [Ar]3d^5 4s²

iv) [Ne]3d^7 4s²


I HOPE IT IS HELPFUL.....☺✌☺