Class 9 Science

# Electronic Configuration

## From Aluminium to Calcium

### Electronic configuration of Aluminium

Atomic number of aluminium = 13.

Therefore number of electrons = 13.

Thus, electronic configuration of aluminium is

Number of orbit in aluminium = 3

### Electronic configuration of Silicon

Atomic number of silicon = 14

Therefore number of electrons = 14

Thus, electronic configuration of silicon is

Number of orbit in silicon = 3

### Electronic configuration of Phosphorous (P)

Atomic number of phosphorous = 15

Therefore number of electrons = 15

Thus, electronic configuration of phosphorous is

Number of orbit in phosphorous = 3

### Electronic configuration of Sulphur (S)

Atomic number of sulphur = 16

Therefore number of electrons = 15

Thus, electronic configuration of sulphur is

Number of orbit in sulphur = 3

### Electronic configuration of Chlorine (Cl)

Atomic number of chlorine = 17

Therefore number of electrons = 17

Thus, electronic configuration of chlorine is

Number of orbit in chlorine = 3

### Electronic configuration of Argon (Ar)

Atomic number of argon = 18

Therefore number of electrons = 18

Thus, electronic configuration of argon is

Number of orbit in argon = 3

### Electronic configuration of Potassium (K)

Atomic number of potassium = 19

Therefore number of electrons = 19

Since, maximum number of electrons in outermost orbit will not be more than 8, thus the 19^{th} electron of potassium atom will reside in 4^{th }orbit.

Thus, electronic configuration of potassium is

Number of orbit in potassium = 4

### Electronic configuration of Calcium (Ca)

Atomic number of calcium = 20

Therefore number of electrons = 20

Thus, electronic configuration of calcium is

Number of orbit in calcium = 4