Question

Last electron of Na is filled in?​

Answer 1

As the atomic number of Sodium (Na) is 11. So the K shell has 2 electrons,L shell has 8 electrons and M shell has 1 electrons. So,the last electron of Na is filled with 1 electron and it is located in 3rd shell which is M.

Other Information :

For 1st energy level,n = 1

So,the maximum number of electrons in 1st energy level

→ 2n²

→ 2 × (1)²

→ 2

For 2nd energy level,n = 2

So,the maximum number of electrons in 2nd energy level

→ 2n²

→ 2 × (2)²

→ 8

For 3rd energy level,n = 3

So,the maximum number of electrons in 3rd energy level

→ 2n²

→ 2 × (3)²

→ 18

For 4th energy level,n = 4

So,the maximum number of electrons in 4th energy level

→ 2n²

→ 2 × (4)²

→ 32

So,the maximum capacity of

• K shell is 2 electrons.
• L shell is 8 electrons.
• M shell is 18 electrons.
• N shell is 32 electrons.

Answer 2

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As the atomic number of Sodium (Na) is 11. So the K shell has 2 electrons,L shell has 8 electrons and M shell has 1 electrons. So,the last electron of Na is filled with 1 electron and it is located in 3rd shell which is M.

Extra Information :

For 1st energy level,n = 1

So,the maximum number of electrons in 1st energy level

→ 2n²

→ 2 × (1)²

→ 2✔

For 2nd energy level,n = 2

So,the maximum number of electrons in 2nd energy level

→ 2n²

→ 2 × (2)²

→ 8✔

For 3rd energy level,n = 3

So,the maximum number of electrons in 3rd energy level

→ 2n²

→ 2 × (3)²

→ 18

For 4th energy level,n = 4

So,the maximum number of electrons in 4th energy level

→ 2n²

→ 2 × (4)²

→ 32✔

So,the maximum capacity of

➻K shell is 2 electrons.

➻L shell is 8 electrons.

➻M shell is 18 electrons.

➻N shell is 32 electrons.