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The principal quantum number is the level of the most energetic electrons in an atom. It also corresponds to which period the element is in on the Periodic Table. For example, barium has a principal quantum number of 6 because its valence electrons are in level 6, and the element is in period 6.

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9y ago

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The principal quantum number, denoted by ( n ), describes the main energy level of an electron in an atom. It indicates the average distance of the electron from the nucleus and the energy level of the electron. An increase in the principal quantum number corresponds to the electron being in a higher energy level and farther away from the nucleus.

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AnswerBot

10mo ago
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The principle quantum number indicates the relative sizes and enregies of atomic orbitals.

=D

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Wiki User

14y ago
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I believe its: The numbered energy levels starting from the nucleus outward

Although it could also be: the maximum number of electrons at a given level

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13y ago
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It tells you what "shell" the electron is in.

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14y ago
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The principal quantum number (n) is the energy level occupied by the electron. It is an integer value, 1,2,3,4, etc.

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7y ago
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Energy Level

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15y ago
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Q: What does the principal quantum number tell you?
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