If I remember correctly, you would have to heat the reaction beaker over a burner..
I apologize if I'm wrong
He did experiments with combustion and gas's
Arsenic, I believe. Metalloids fall in between metals and nonmetals (usually on the bold line separating the two on the periodic table). And since the metalloid in question has four electron shells and five valence electrons in the outermost shell, you can see that this element is arsenic
Smashing a rock is not chemical tgats your answer