Electron Configuration?

Question

Which of the following statements regarding electron configurations is true?

I. An orbital can hold a maximum of two electrons.

II. Both electrons in an orbital can have the same spin.

III. When forming cations of iron, the 4s electrons are removed before the 3d.

IV. For the hydrogen atom, the 2s and 2p orbitals have the same energy.



a. I only

b. I and II only

c. I and III only

d. I, III, and IV only

e. I, II, III, and IV

Answer 1

d. if 2 electrons had they same spin, they wouldn't want to near each other. A hydrogen atom can have 2s and 2p orbitals, it's just that the electron wouldn't usually be found there unless it was excited. 2s and 2p orbitals are said to be degenerate, which means that they have the same energy. Applies to all orbitals on the same energy level, like 3s, 3p, and 3d.

Answer 2

I believe it is C

An orbital can only hold 2 electrons with opp. spins.Hydrogen doesnt have a 2s and 2p. And for electrons taking goes in this order p,s,d,f

Answer 3

d because all orbitals have 2 different spins or things would go berserk.