Question

Which of the following electron configurations of neutral atoms represent excited states?

[Xe]6s^2 4f^1
[Ar]4s^2 3d^3
1s^2 2s^2 2p^6 3s^2 3p^6 3d^2
[Kr]5s^1 4d^5
2s^2

Which neutral atoms have the following electron configurations? Enter the name or symbol.

[Ar]4s^2 3d^3

[Kr]5s^1 4d^5

Answer 1

I'll give you a hint for 1.
Look at the last one. It must be excited since the ground state would be 1s2 to start. Look at the one before that. It has 5s1 + others but 5s2 is the ground state. There may be others there.

#2. Count the electrons. For the first one I count 18 + 2 + 3 = 23. Which element is #23. That's V isn't it.