Question

answaer the ques as fast as u can​

Answer 1

The electronic configuration for first 19 electrons of Fe will be 1s  

2

2s  

2

2p  

6

3s  

2

3p  

6

4s  

1

.

The 20th electron enters 4s subshell.

So, n=4

For s-orbital ⇒l=0

magnetic quantum no. ⇒m=0

Spin quantum no. ⇒s=−  

2

1

​

 

Hence, the four quantum numbers n, l, m, and s of 20th electron of Fe (Z = 26) ion would be 4,0,0,−  

2

1

​

 respectively.

Answer 2

Answer:

s,p,d,f is called as shell or orbit .which electron's revolve.

Explanation:

S=2,

S=2,P=4

S=2,P=4(for mg )

S=2

S=2,P=4,

S=2,P=4,D=8

S=2,P=4.