Orbitals, heisenberg principle, bonding

[Ice-cream]

hey guys, i have 2 questions...hopefully u can help me out!

 

1. this multiple choice MAY have more than 1 answers...but i only got 1 answer so i just want to know whether u guys think there's only 1 answer as well.

 

Which of the following statements is/are incorrect?

 

(a) The exact momentum and position of an electron cannot be determined.

(b) Lower energy orbitals are filled with electrons before higher energy orbitals.

© When filling orbitals of equal energy, 2 electrons will occupy the same orbital before filling a new orbital.

(d) No two electrons in a particular atom can have the same value for all 4 quantum numbers.

 

(i got © as the incorrect statement. are there anymore there do u think?)

 

2. For which of the following species if more than one lewis (resonance) structure required to correctly describe the molecule?

(a) Li2S (b) NH3 © NO2- (d) ClO4- (e) none of these

 

(i got © where O=N-O. what do u guys think?)

[Dave]

I don't think there are any more myself for the first one. As for the second, I have no idea

[5614]

LOL, dave, I totaly agree with you!

 

I'm sure you got Q1 correct... don't have a clue for Q2!

 

In Q1

a = true = uncertainity principle

b = true = that's just how it works, I've never heard of any exceptions

c = false = this is true only for the s orbitals, not the p and d

d = true = if it were false then this would violate the pauli exclusion principle, it would break the basic rules which fermions follow.