# Structure of Atom

## Electronic ConfigurationFrom 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 19th electron of potassium atom will reside in 4th 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