The substances that start a chemical reaction are called?

Part of molten rock at mid-ocean ridges

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

List and describe the neurological effects of the vocs and other air pollutants,as described by dr.theo colborn