Question

8. Number of electrons exchanges in d4 configuration
(1) 2
(2) 4
(3) 6
(4) 8
the answer is 6
please explain​

Answer 1

let's take the case of chromium i.e., atomic number 24

so, its electronic configuration should be 4s2 - 3d4 ( bcoz of aufbau principle...i.e., nearly same energy vale phle fill honge )

but its electronic configuration is 4s1 - 3d5 ....means one electron from 4s subshell gets shifted to 3d subshell...and this happens bcoz by doing this 3d has 5 electrons which means a half filled subshell
we all know that a fully filled or half filled subshell is always more stable...

so, now atom can exchange 6 electrons with each of the orbital of s and p subshell...

Answer 2

Answer:

Using public transports. ...

Turn off the lights when not in use. ...

Recycle and Reuse. ...

No to plastic bags. ...

Reduction of forest fires and smoking. ...

Use of fans instead of Air Conditioner. ...

Use filters for chimneys. ...

Avoid usage of crackers.