Because they absorb energy.
no
Energy must be emitted for an electron to return to the ground state. This energy typically occurs in the form of a photon--a particle/wavelet of light. Flourescent bulbs, for example, conduct a current through a gas knocking electrons into higher, more exicted orbits. As the electrons decay into lower orbits, light is emitted, producing the flourescent glow.
When an electron moves to a lower energy level, the difference in energy appears in the form of a photon, which the electron emits.
jumps to the a higher orbital. This is only possible if the energy it absorbed is large enough to let it jump the gap. If the energy is not large enough for the electron to jump that gap, the electron is forbidden to absorb any of that energy.
When an electron returns to its ground state it emits energy in the form of light.
no
When an electron moves to a lower energy level, the difference in energy appears in the form of a photon, which the electron emits.
Energy must be emitted for an electron to return to the ground state. This energy typically occurs in the form of a photon--a particle/wavelet of light. Flourescent bulbs, for example, conduct a current through a gas knocking electrons into higher, more exicted orbits. As the electrons decay into lower orbits, light is emitted, producing the flourescent glow.
An excited electron releases a photon as it returns to ground state.
The electron configuration of 1s22s22p3s1 is not the ground state electron configuration of any element. This configuration contains 8 electrons, which in the ground state would be oxygen. The ground state configuration of oxygen is 1s22s22p4.
ground state
Ground state electron configuration of zinc (Zn): [Ar]3d104s2.
jumps to the a higher orbital. This is only possible if the energy it absorbed is large enough to let it jump the gap. If the energy is not large enough for the electron to jump that gap, the electron is forbidden to absorb any of that energy.
When an electron returns to its ground state it emits energy in the form of light.
The ground state electron configuration for nitrogen is [He]2s2.2p3.
This electron is in an excited unstable state.
The ground state electron configuration of the hydrogen atom is 1s1, and for helium it is 1s2.