C. the electron gains energy
When an electron moves to a higher state ,it means that the electron is excited !!!!!! or any state above the ground state
By states I mean the principal energy levels or electron shells named as
n = 1 is shell which is closest to the atom's nucleus
These shells are also represented as letters starting from
Therefore the no. of electrons in K shell of carbon is 2.
When the electron moves a higher state from its ground state it gains Potential Energy as it feels less attraction from the nucleus.
While when it moves a shell below like