Which of the following represents an excited state of an atom?
CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure
Problem
Which of the following represents an excited state of an atom?
(1) [Ne] 3s^2 3p^6 4s^2 3d^8
(2) [Ne] 3s^2 3p^6 4s^1 3d^5
(3) [Ne] 3s^2 3p^6 4s^2 3d^1
(4) 1s^2 2s^2 2p^5 3s^1