Chapter 2 Practice Test (1).doc - BIO170 Chapter 2 PracTce...

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BIO170 Chapter 2 Practice Test This activity contains 20 questions. 1. If an atom gains an electron then _B_____. A. it becomes an isotope B. it acquires a negative charge C. its atomic number changes D. its mass number changes 2. Which four elements make up 96 percent of matter found in living organisms? 3. What is the difference between 12 C and 13 C? A. 12 C always forms nonpolar covalent bonds with hydrogen, whereas 13 C forms polar covalent bonds. B. 12 C can form four covalent bonds and 13 C only forms three C. 12 C has one less proton than 13 C. D. 12 C has one less neutron than 13 C 4. An element in the second row of the periodic table that has four valence electrons would most likely _____.
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