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The "n levels" are the principal energy levels. The n is the principal quantum number, which tells you how far away from the nucleus the electrons are as well as how much energy those electrons have. Increasing n means that distance from the nucleus as well as electron energy is increasing.
The n levels are principal energy levels that are very important to know in order to do Rydberg equation problems. The change in energy is the energy of the final level minus the energy of the initial, solved by substituting in the Rydberg equation. You use the quantum number of the energy level in the denominator of the Rydberg equation. N levels also correspond to light series. For the Lyman series, electrons always end in n=1. For the Balmer series, electrons always end in n=2.
n-levels are energy levels that electrons can jump to are fall from. Jumping energy levels requires energy to be put into the electron (exciting it) and electrons that fall from higher energy levels to lower emit energy to get back to their ground state.
The N value signifies the energy level of an electron, and is called the Principle Quantum Number. The n value increase basically when an electron is excited and increases in energy level.The n value decreases when an electron emits energy and decreases in energy level.
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