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Ch.8 - Basic Concepts of Chemical Bonding
All textbooksBrown 14th EditionCh.8 - Basic Concepts of Chemical BondingProblem 40a,b
Chapter 8, Problem 40a,b

By referring only to the periodic table, select (a) the most electronegative element in group 13; (b) the least electronegative element in the group As, Se and Br;

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To determine the most electronegative element in group 13, first identify the elements in this group. Group 13 of the periodic table includes B (Boron), Al (Aluminum), Ga (Gallium), In (Indium), and Tl (Thallium). Electronegativity generally increases across a period and decreases down a group.
Compare the electronegativities of the elements in group 13. Boron, being at the top of the group, is expected to have the highest electronegativity due to its position in the periodic table.
For part (b), identify the elements As (Arsenic), Se (Selenium), and Br (Bromine) on the periodic table. These elements are located in the same period, with Bromine being a halogen.
Electronegativity tends to increase across a period from left to right. Therefore, compare the electronegativities of As, Se, and Br. Arsenic, being furthest to the left, is expected to have the lowest electronegativity.
Conclude by selecting Boron as the most electronegative element in group 13 and Arsenic as the least electronegative element among As, Se, and Br, based on their positions in the periodic table.

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Related Practice
Textbook Question

Which of the following statements about electronegativity is false? (a) Electronegativity is the ability of an atom in a molecule to attract electron density toward itself. (b) Electronegativity is the same thing as electron affinity. (c) The numerical values for electronegativity have no units. (d) Fluorine is the most electronegative element. (e) Cesium is the least electronegative element.

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Open Question
(a) What is the trend in electronegativity going from left to right in a row of the periodic table? (b) How do electronegativity values generally vary going down a column in the periodic table? (c) True or false: The most easily ionizable elements are the most electronegative.
Textbook Question

Using only the periodic table as your guide, select the most electronegative atom in each of the following sets: (a) Se, Te, Br, I; (b) Be, Mg, C, Si (c) Al, Si, P, S (d) Zn, Ge, Ga, As.

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Textbook Question

By referring only to the periodic table, select (d) the element in the group K, C, Zn, F that is most likely to form an ionic compound with Ba.

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Textbook Question

Which of the following bonds are polar? (a) C—O, (b) Sl—F, (c) N—Cl, (d) C—Cl. Which is the more electronegative atom in each polar bond?

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Textbook Question

Arrange the bonds in each of the following sets in order of increasing polarity: (a) C—F, O—F, Be—F (b) O—Cl,S—Br, C—P

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