The completed chart atomic number 19 is as below ,
1S 2
2s 2
2p 6
3s 2
3p 6
4s 1
3d 0
4p 0
5s 0
Explanation
According to Aufbau principle in ground state, electrons of atom fill the atomic orbital of lowest energy level before occupying that of higher energy level .
- 1s orbital is of lower energy and is filled first , followed by 2s orbital , 2p orbital , 3s orbital, 3p orbital and finally 4s orbital
- S orbital can hold a maximum of 2 electrons . P orbital can hold a maximum of 6 electrons while d orbital can hold a maximum of of 10 electrons.
Therefore element in atomic number 19 has 1s2 2s2 2p6 3s2 3p6 4s1 electron configuration .
