All the noble gases, except for helium, have 8 valence electrons. Helium has 2 valence electrons. The valence electrons participate in chemical bonding processes and are present in the outermost shell. Noble gases are the least reactive of all elements and have a fully filled outer shell of electrons.


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Valence electrons are the electrons in the outermost shell of an atom of a given element. These electrons participate in the bond formation, as long as the outer shell is not completely filled.

The valence electrons can be donated or accepted in an ionic bond or shared in a covalent...


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Valence electrons are the electrons in the outermost shell of an atom of a given element. These electrons participate in the bond formation, as long as the outer shell is not completely filled.

The valence electrons can be donated or accepted in an ionic bond or shared in a covalent bond.

Noble gases are the elements of group 18 of the periodic table of elements. These elements include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The noble gases are also known as inert elements, because they have very low chemical reactivity— that is, the atoms of these elements (or noble gases) rarely participate in a chemical reaction.

The noble gases follow the rule of octet. In other words, their outermost shells contain 8 electrons, except for helium, whose outermost shell contains 2 electrons. The valence electrons of the noble gases are used as a standard of nonreactivity, and the reactivity of other elements is explained in terms of their desire to achieve the same level of valence electrons as the noble gases. In other words, when bonding takes place, electrons are shared/exchanged in such a way that the interacting atoms achieve a completely filled outer shell of electrons.

Also, note that even though helium has only 2 electrons in the outermost shell, it still has the fully filled shell and its configuration is 1s2.

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In summary, the noble gases have 8 valence electrons each, except for helium, which has 2 valence electrons.