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Textbook Question
Chapter 5, Problem 1E

What is electronegativity? What are the periodic trends in electronegativity?

Expert Solution & Answer
Check Mark
Interpretation Introduction

To determine: Definition of electronegativity and periodic trends in electronegativity.

Answer to Problem 1E

Solution:

Electronegativity is the tendency of an element to attract electrons.

In the periodic table, electronegativity increases along a period and decreases down a group.

Explanation of Solution

Electronegativity is a chemical property of some elements (like oxygen, nitrogen etc.), due to which an atom has the tendency to attract shared pair of electrons towards itself. This results in unequal distribution of electrons.

In the modern periodic table, elements are arranged in order of their increasing atomic number. For this reason, along a period, more and more electrons are added from left to right. As a result, the distance between the nucleus and valence electrons decreases. This increases the electronegativity.

However, down the groups, more and more electronic shells are added due to increase in atomic numbers. As a result, the distance between the nucleus and valence electrons increases. For this reason, electronegativity decreases down the group.

Example:

Electronegativity of oxygen is less than fluorine although both are Period 2 elements.

Electronegativity gradually decreases down group VII because the electronegativity of chlorine is less than fluorine although both elements belong to group VII.

Conclusion

Conclusion:

The electronegativity increases along a period and decreases down a group.

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Chapter 5 Solutions

Chemistry: Structure and Properties Plus Mastering Chemistry with Pearson eText -- Access Card Package (2nd Edition) (New Chemistry Titles from Niva Tro)

Ch. 5 - Prob. 11ECh. 5 - Prob. 12ECh. 5 - What is bond energy?Ch. 5 - Give some examples of some typical bond lengths....Ch. 5 - Why is molecular geometry important? Cite some...Ch. 5 - According to VSEPR theory, what determines the...Ch. 5 - Name and draw the five basic electron geometries,...Ch. 5 - Explain the difference between electron geometry...Ch. 5 - List the correct electron and molecular geometries...Ch. 5 - How do you apply VSEPR theory to predict the shape...Ch. 5 - How do you determine if a molecule is polar?Ch. 5 - Why is polarity a key connection between the...Ch. 5 - Prob. 23ECh. 5 - Determine if a bond between each pair of atoms...Ch. 5 - Prob. 25ECh. 5 - Draw the Lewis structure for BrF with an arrow...Ch. 5 - Prob. 27ECh. 5 - Write the Lewis structure for each molecule. NF3...Ch. 5 - Prob. 29ECh. 5 - Write the Lewis structure for each molecule. CH2O...Ch. 5 - Prob. 31ECh. 5 - Prob. 32ECh. 5 - Write the Lewis structure for each molecule or ion...Ch. 5 - Prob. 34ECh. 5 - Write a Lewis structure that obeys the octet rule...Ch. 5 - Prob. 36ECh. 5 - Use formal charge to determine which Lewis...Ch. 5 - Prob. 38ECh. 5 - How important is this resonance structure to the...Ch. 5 - Prob. 40ECh. 5 - Prob. 41ECh. 5 - Prob. 42ECh. 5 - Determine the formal charges of the atoms shown in...Ch. 5 - Prob. 44ECh. 5 - Prob. 45ECh. 5 - Write the Lewis structure for each molecule (octet...Ch. 5 - Prob. 47ECh. 5 - Write Lewis structures for each molecule or ion....Ch. 5 - Prob. 49ECh. 5 - Write Lewis structures for each molecule or ion....Ch. 5 - List these compounds in order of increasing...Ch. 5 - Which of these compounds has the stronger...Ch. 5 - A molecule with the formula AB3 has a trigonal...Ch. 5 - A molecule with the formula AB3 has a trigonal...Ch. 5 - For each molecular geometry shown here, list the...Ch. 5 - For each molecular geometry shown here, list the...Ch. 5 - Determine the electron geometry, molecular...Ch. 5 - Determine the electron geometry, molecular...Ch. 5 - Which species has the smaller bond angle, H3O+ or...Ch. 5 - Which species has the smaller bond angle; C1O4- or...Ch. 5 - Determine the molecular geometry and draw each...Ch. 5 - Determine the molecular geometry and draw each...Ch. 5 - Determine the molecular geometry about each...Ch. 5 - Prob. 64ECh. 5 - Prob. 65ECh. 5 - Prob. 66ECh. 5 - Prob. 67ECh. 5 - Determine the geometry about each interior atom in...Ch. 5 - Explain why CO2 and CCl4 are both nonpolar even...Ch. 5 - CH3F is a polar molecule, even though the...Ch. 5 - Determine whether each molecule in Exercise 57 is...Ch. 5 - Prob. 72ECh. 5 - Determine whether each molecule or ion is polar or...Ch. 5 - Determine whether each molecule is polar or...Ch. 5 - Each compound contains both ionic and covalent...Ch. 5 - Prob. 76ECh. 5 - Carbon ring structures are common in organic...Ch. 5 - Prob. 78ECh. 5 - Prob. 79ECh. 5 - Diazomethane is a highly poisonous, explosive...Ch. 5 - Prob. 81ECh. 5 - Phosgene (Cl2CO) is a poisonous gas that was used...Ch. 5 - The cyanate ion (OCN-) and the fulminate ion...Ch. 5 - Prob. 84ECh. 5 - Prob. 85ECh. 5 - Prob. 86ECh. 5 - Prob. 87ECh. 5 - Prob. 88ECh. 5 - Prob. 89ECh. 5 - Free radicals are important in many...Ch. 5 - A compound composed of only carbon and hydrogen is...Ch. 5 - A compound composed of only carbon and chlorine is...Ch. 5 - Prob. 93ECh. 5 - The genetic code is based on four different bases...Ch. 5 - Prob. 95ECh. 5 - Prob. 96ECh. 5 - Prob. 97ECh. 5 - A 0.167-g sample of an unknown compound contains...Ch. 5 - Use the dipole moments of HF and HCI (given at the...Ch. 5 - One form of phosphorus exists as P4 molecules....Ch. 5 - A compound has the formula C8H8 and does not...Ch. 5 - Draw the Lewis structure for acetamide (CH3CONH2),...Ch. 5 - Prob. 103ECh. 5 - In the very first chapter of this book, we...Ch. 5 - Which statement best captures the fundamental idea...Ch. 5 - Prob. 106ECh. 5 - Have each member of your group represent an atom...Ch. 5 - Prob. 108ECh. 5 - Prob. 109ECh. 5 - Prob. 110ECh. 5 - Pass a piece of paper around the group and ask...Ch. 5 - Prob. 112ECh. 5 - At least two different numbers of electron groups...Ch. 5 - Prob. 114ECh. 5 - The VSEPR model is useful in predicting bond...Ch. 5 - Which set of elements is arranged in order of...Ch. 5 - Prob. 2SAQCh. 5 - Which pair of atoms forms the most polar bond? C...Ch. 5 - Which pair of atoms forms a nonpolar covalent...Ch. 5 - Prob. 5SAQCh. 5 - Prob. 6SAQCh. 5 - Prob. 7SAQCh. 5 - Prob. 8SAQCh. 5 - Prob. 9SAQCh. 5 - Prob. 10SAQCh. 5 - Prob. 11SAQCh. 5 - Predict the relative bond angles in BF3 and SO2Ch. 5 - Predict the molecular geometry about N in the...Ch. 5 - Which molecule is polar?
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