Final answer:
The claim that an electron remains indefinitely in an excited state is false. Electrons in excited states return to the ground state shortly, by emitting photons.
Step-by-step explanation:
The statement that an electron continuously stays in its excited state when nothing occurs after is false. An atom typically exists in its ground state, which is the state of lowest possible energy. When an atom absorbs energy, an electron may jump to a higher energy level, placing the atom in an excited state. However, this is a temporary condition. The atom usually returns to its ground state within an extremely short timeframe, usually about a hundred-millionth of a second, by emitting a photon. This process can occur in a single transition or through multiple steps involving intermediate energy levels. Therefore, electrons do not remain in an excited state indefinitely.