In asymptotic giant branch stars, the third dredge-up removes the remnants of a "shell" this element forms around the core. This element is consumed in a reaction that generates power proportional to the square of density and roughly the fortieth power of temperature at around 100 million kelvins. A mechanism for producing this element sometimes produces fluorine as an intermediate and was proposed by (*) Bethe and Weizsäcker. In some low-mass stars, this element's runaway fusion causes its namesake "flash." This element is created via the CNO cycle and the protonproton chain, and it "burns" 
In asymptotic giant branch stars, the third dredge-up removes the remnants of a "shell" this element forms around the core. This element is consumed in a reaction that generates power proportional to the square of density and roughly the fortieth power of temperature at around 100 million kelvins. A mechanism for producing this element sometimes produces fluorine as an intermediate and was proposed by (*) Bethe and Weizsäcker. In some low-mass stars, this element's runaway fusion causes its namesake "flash." This element is created via the CNO cycle and the protonproton chain, and it "burns" in the triple-alpha process. For 10 points, name this element that is created in stars by the fusion of hydrogen.
In asymptotic giant branch stars, the third dredge-up removes the remnants of a "shell" this element forms around the core.
helium [or He; or helium nucleus; or alpha particle]