What fraction of the space within the atom is occupied by the nucleus? The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0 X 10^-13cm. The hydrogen atom itself has a radius of approximately 52.9pm (picometers).

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.

In the reading, yao chen-yuan describes traveling to deliver a message. why was he willing to risk danger to travelto tientsin? he wanted to the boxers with their cause

Can someone me with questions 15 to 17 plz.