Brooklyn College The City University of New York Core 104O The Making of the Ato

Question

Brooklyn College The City University of New York Core 104O The Making of the Atomie Bomb Test Name Circle the ONE BEST answer to each question. Good luck!. 1. Aston's measurements with the mass spectrograph showed that the mass of the carbon-12 nucleus was the mass of 12 hydrogen nuclei a) slightly less than b) exactly equal to c) slightly more than 2. Aston's work showed that nuclei in the middle of the periodic table than the lightest and heaviest nuclei. a) are more loosely bound b) are more tightly bound c) have more isotopes d) are more unstable e) are more abundant 3. As a result of Aston's work, we know that two nuclei are isotopes when they have a) the same atomic weight but different atomic numbers b) the same atomic number but different atomic weights c) the same atomic number and the same atomic weight d) different atomic weights and different atomic numbers 4discovered the positron. a) Carl Anderson b) Irene Joliot-Curie c) Otto Hahn d) Enrico Fermi e) Arthur Dempster f)Niels Bohr g) James Chadwick 5. In 1931, the Joliot-Curies discovered that a very penetrating radiation resulted from the bombardment of beryllium by alpha particles. They wrote a paper in which they identified this radiation as a) electrons b) positrons c) neutrons d) gamma rays

Explanation / Answer

1) c ) Sligjly more than

2) c) have more isotopes

3) b) same atomic number but different atomic weights.

d) a) Carl Anderson

5) b) positron

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