We’re asked to determine if the hydrogen atom will "expand" or "contract" when an electron is excited from the n = 1 state to the n = 4 state.
Recall that the atomic radius is the distance between the nucleus and its outermost electron orbital.
Hydrogen, H has an atomic number =1, so, it only has 1 electron.
Since a higher energy orbital has a larger radius than a lower energy orbital. This means that:
Does the hydrogen atom "expand" or "contract" when an electron is excited from the n = 1 state to the n = 4 state?
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