52_100_Quiz1B_key_F07

52_100_Quiz1B_key_F07 - 52.100 Chemistry and the Citizen...

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52.100 Chemistry and the Citizen Quiz #1B Tuesday September 11, 2007 1. The total number of known isotopes of hydrogen is a. 5 b. 4 c. 3 d. 2 e. 1 2. The elements carbon, C, Nitrogen, N, Oxygen O, Fluorine, F, and Neon, Ne are all in the same __________ on the periodic table. a. Period b. Club c. Group d. Section 3. Elements such as lithium, Li, strontium, Sr, aluminum, Al, tellurium, Te are known as a. Main group elements b. Transition metals c. Lanthanides d. Actinides 4. The atomic number of a certain atom is 15. The number of valence electrons in this atom is a. 1 b. 2 c. 3 d. 4 e. 5 5. Adding one proton to the nucleus of an atom a. Converts it to an isotope of the same element b. Increases the mass number by one unit, but does not change the atomic number c. Increases the mass number by one unit but does change the atomic number d. Does not change either the atomic number or the atomic mass e. Converts it to an atom of a different element
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6. The number of valence electrons in an atom of chlorine is a. 10 b. 8 c. 7 d. 2 e. 1 7.
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This homework help was uploaded on 04/03/2008 for the course CHEM 101 taught by Professor Hawrelak during the Fall '07 term at Bloomsburg.

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52_100_Quiz1B_key_F07 - 52.100 Chemistry and the Citizen...

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