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NAME ________________________ CHEMISTRY 20 ASSIGNMENT 2-5 TOPIC(S) COVERED: Text (4-43) TOTAL MARKS: 35 DIRECTIONS: Read each question carefully and choose the best answer. 1. As one proceeds down the column of the alkaline earth metals, the reactivity tends to A. decrease because the nucleus exerts a weaker pull on the valence electrons B. increase because the valence electrons are less attracted to the nucleus C. increase because there are a greater number of protons in the nucleus D. decrease because there are more valence electrons in the atom itself 2. Electronegativity can best be defined as A. the degree to which an electron will leave an atom B. the degree to which an atom wants to gain more electrons C. a relative measure showing how many bonds an atom will form D. a relative measure showing the degree to which electrons can be removed from an atom 3. A valence electron is A. the electron closest to the nucleus of an atom B. any electron in the lowest energy level of an atom C. the electron that is gained when an anion is formed D. any electron that does not take part in chemical bonding 4. As one proceeds from the lower left to the upper right on the periodic table, one should expect that the A. valence electrons will be held more tightly, causing the atom to decrease in size B. reactivity will increase until the noble gases when the reactivity becomes very low C. electronegativity will become greater with helium having the greatest electronegativity D. electrons will be held more loosely, causing an increase in reactivity until the noble gases 5. Use these statements about valence electrons to answer the question. 1. All valence electrons are used to form bonds with other atoms or ions. 2. Bonding electrons are represented by a single dot in an electron dot diagram. 3. When two electrons occupy the same valence orbital of an atom, they form a lone pair of electrons. 4. The last digit of a group number represents the number of valence electrons in the representative elements. The true statements are A. 1, 2, and 3 B. 1, 2, and 4 C. 1, 3, and 4 D. 2, 3, and 4
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6. The electron dot diagram for a phosphorus atom is A. B.
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This note was uploaded on 04/09/2010 for the course CHEMISTRY 1AA3 taught by Professor Goneer during the Spring '08 term at McMaster University.

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