When was the octet rule invented?

Answer 1

Although it was a slow process involving numerous years of research and chemists, in 1919 Irving Langmuir refined the concept into the cubical octet atom and octet theory. This octet theory evolved into what is now known as the octet rule.

Answer 2

In 1904 Richard Abegg formulated what is now known as Abegg's rule, which states that the difference between the maximum positive and negative valences of an element is frequently eight. This rule was used later in 1916 when Gilbert N. Lewis formulated the "octet rule" in his cubical atom theory.

Answer 3

The octet rule was proposed in the early 20th century by Gilbert N. Lewis in 1916 as a way to explain the stability of noble gas configurations in atoms. It suggests that atoms tend to lose, gain, or share electrons in order to achieve a full outer shell of eight electrons.