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Giúp tui vs

Ametal with a large number of free flowing electrons most likely has good conductivity

When the electrons fall back down and leave the excited state, energy is re-emitted in the form of a photon. the wavelength (or equivalently, frequency) of the photon is determined by the difference in energy between the two states. these emitted photons form the element's spectrum.

The answer is a. good luck : )