To ensure accurate recall of the experimental data, at minimum one should:

answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;

if you mean hydrogen and oxygen then water is the product

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.