1.
A) synthetic elements B) degraded elements C) alpha products D) isotopes 2.
A) It could not be seen without a microscope. B) He used a magnet to bend the beam, and light cannot be bent by a magnet. C) Light is not made up of particles. D) The negatively charged particles in the beam were attracted to the negatively charged cathode. 3.
A) electron B) neutron C) alpha D) proton 4.
A) These particles were attracted to the positively charged anode, and he knew that opposite charges attract each other. B) These particles were attracted to the negatively charged cathode, and he knew that like charges attract each other. C) The particles were spread evenly throughout the tube. D) Some of the particles went veering off at large angles to the tube. 5.
A) equal numbers of protons and neutrons B) the release of an alpha particle from americium-241 in a smoke detector C) protons and neutrons packed tightly in the nucleus D) too many neutrons 6.
A) mixture B) compound C) metal D) element 7.
A) If atoms contained only electrons and empty space, then alpha particles should bounce right off of them and never pass through. B) If atoms contained only negative charges, all matter would be negatively charged, and it is not. C) He knew that positive charges existed within the atom because the cathode ray was attracted to a negatively charged surface. D) If atoms contained only negative charges, the particles in the cathode ray would not be attracted toward the anode. 8.
A) electrode B) electron C) foil D) alpha particle 9.
A) nuclear fusion B) transmutation C) periodic shift D) half-life 10.
A) electrons B) protons C) neutrons D) alpha particles 11.
A) They are held together by the strong nuclear force. B) They are far enough apart that their like charges do not repel each other. C) The negative areas of protons are attracted to the positive areas of other protons and hold the nucleus together. D) The negatively charged neutrons cancel the net positive charge of the protons in the nucleus. 12.
A) half-life B) nucleus number C) mass number D) atomic number 13.
A) electron B) nucleus C) proton D) neutron 14.
A) John Dalton B) Ernest Rutherford C) J.J. Thomson D) Isaac Newton 15.
A) It was the cathode and generated high-speed electrons. B) It was the electrode and conducted the negative charges through the foil. C) It flashed when hit by a charged particle and was used to track the motion of the alpha particles. D) It was used to bend the stream of alpha particles. 16.
A) ball of raisin-cookie dough with raisins representing electrons B) electron cloud C) small ball within a large shell containing empty space D) solid ball the same throughout 17.
A) Beta particles B) Isotopes C) Compounds D) Alpha particles 18.
A) if Thomson's model of the atom was correct B) if Dalton's model of the atom was correct C) the speed at which alpha particles travel D) the size of the electron orbit 19.
A) mass number; protons plus neutrons in the outermost energy level B) atomic number; protons in the nucleus C) mass number; neutrons in the nucleus D) atomic mass; protons in the nucleus 20.
A) how fast a radioactive sample will decay B) the best method for the disposal of a radioactive sample C) the age of sedimentary rock layers D) the age of dead plants and animals
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