Some questions on energy of orbitals

[Ezio3.1415]

1. We know px,py,pz are degenerate orbitals... My question is suppose in
0=[He] 2s^2 2px^2 2py^1 2pz^1
Are the px,py,pz orbitals degenerate here?

2. What is the true reason of inert pair effect?

3. What is the order of shielding effect for s,p,d,f?I just want to verify my answers...

 

[berkeman]

1. We know px,py,pz are degenerate orbitals... My question is suppose in
0=[He] 2s^2 2px^2 2py^1 2pz^1
Are the px,py,pz orbitals degenerate here?

2. What is the true reason of inert pair effect?

3. What is the order of shielding effect for s,p,d,f?


I just want to verify my answers...

Please show your work and your answers.

 

[Ezio3.1415]

1. the orbitals were degenerate... Now px is more stable,means less energy... so py and pz are degenerate...

2. I know about it... Was expecting an answer and justify whether the things I read are true...

3. s>p>d>f
my ques is why?