Chapter 9, Problem AM

To determine

Pick the keyword from the given list: Electron levels having higher than normal energy.

Answer to Problem AM

Electron levels having higher than normal energy are excited states.

Explanation of Solution

Excited states are the states having value of principal quantum number $n$ greater than $1$. Energy of state increases with an increase in $n$.

Ground state is the state having minimum energy. Principal quantum number corresponding to ground state is $1$. All the other energy states have higher energy than the ground state.

Conclusion:

Therefore, the word excited states can be picked from the list.