You attained 0.0382811 moles of an unknown element. The mass of the element is measured to be 8.00g. Identify the element and calculate how many particles are in the element.

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?