Sodium and potassium have similar chemical properties because their atoms in the ground state have A. equal numbers of protons and electrons.
B. equal ratios of protons and neutrons.
С. two electrons in the first electron shell.
D. one electron in the outermost shell.

Which of the following is a physical property flammability heat of combustion solubility and toxicity

Temperature is defined as a. the equivalent of heat. b. a measure of the average kinetic energy of the individual atoms or molecules composing a substance. c. how hot or cold it is. d. the total kinetic energy of the atoms or molecules composing a substance. e. none of the above is correct.

According to thomson, the atom is a positively charged cloud with electrons scattered throughout. what would the alpha particles do when they hit the foil if thomson were correct