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Contents Home Bookshelves Introductory, Conceptual, and GOB Chemistry Book: Introductory Chemistry (CK-12) 5: Electrons in Atoms Expand/collapse global location

5.18: Noble Gas Configuration

Last updatedAug 24, 2020

5.17: Valence Electrons

5.19: Hund's Rule and Orbital Filling Diagrams

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You had a great meal, but cannot put another bite in your mouth because there is no place for it to go. The noble gases have the same problem - there is no room for any more electrons in their outer shells. They are completely full and cannot handle any more.

Noble Gas Configuration

Sodium, element number eleven, is the first element in the third period of the periodic table. Its electron configuration is 1s22s22p63s1 . The first ten electrons of the sodium atom are the inner-shell electrons and the configuration of just those ten electrons is exactly the same as the configuration of the element neon (Z=10) . This provides the basis for a shorthand notation for electron configurations called the noble gas configuration. The elements that are found in the last column of the periodic table are an important group of elements that are called the noble gases. They are helium, neon, argon, krypton, xenon, and radon. A noble gas configuration of an atom consists of the elemental symbol of the last noble gas prior to that atom, followed by the configuration of the remaining electrons. So for sodium, we make the substitution of [Ne] for the 1s22s22p6 part of the configuration. Sodium's noble gas configuration becomes [Ne]3s1 . Table 5.18.1 shows the noble gas configurations of the third period elements.

Explanation:

By the way the answer is

letter:C