Question

25. What is wrong with the following configurations of some unknown elements W,
X,Y,Z?
W:
11
X:1s2,2s2, 3s
Y: 1s?, 252, 2p, 32, 3p6,3d?
Z: 1s?, 22, 2px?, 2py?
Point out the rule, which has been disobeyed while writing these configurations.​

Answer 1

Answer:

Explanation:

The electron configuration of an atom shows the number of electrons in each sublevel in each energy level of the ground state atom.  

Here, 1s  

2

2s  

2

2p  

6

3s  

2

3p  

2

3d  

5

4s  

1

 is ground state electronic configuration of Cr.

Note: To write the electronic configuration a more convenient way is shown in figure below.