““Actually, under stellar conditions matter is generally so highly ionized that, as we shall see in greater detail in chapter vii, the uncertainty in the chemical composition s essentially due to the uncertainty in the abundance of the two lightest elements, namely, hydrogen and helium. The abundance of the lightest elements, has then to be considered as a fresh parameter in the discussion. We can thus summarize by saying that our fundamental problem is to seek a theoretical relation of the kind F[L, M, R, abundance of hydrogen and helium] = 0.””
![“[The unreactivity of the noble gas elements] belongs to the…” quote by Friedrich Paneth](https://sms4smile.com/quotes/img-quotes/c65/friedrich-paneth-176883_elements_the-unreactivity-of-the-noble-gas-elemen_2741953.jpg)
