I will give brainliest!!! 8th grade

Which is true of the reactants in this displacement reaction? fe + 2hcl fecl2 + h2 a. the reactants are located to the left of the arrow in the chemical equation. b. the reactants contain 1 iron atom, 2 hydrogen atoms, and 1 chlorine atom. c. the reactants are the atoms, molecules, or compounds formed in the reaction. d. the reactants have the same physical and chemical properties as the products.

How manyatoms of mercury are in 1.4214e+1 ml sample

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions