Help asapThere are several elements that begin with "?" – three of them are located in Gruppo III. Knowing that the symbol has changed over the
last 150 years, identify those two elements ("?Yt=88" and "?Di=138")
and explain how you arrived at their identity.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)