Multiple Choice
Which of the following bonds is the most polar due to the greatest difference in electronegativity between the two atoms?
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10. Periodic Properties of the Elements
Periodic Trend: Electronegativity
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Which statement best describes the trend in electronegativity values across a period in the periodic table?
A
Electronegativity decreases from left to right across a period.
B
Electronegativity increases from left to right across a period.
C
Electronegativity first increases and then decreases across a period.
D
Electronegativity remains constant across a period.
Verified step by step guidance1
Understand that electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond.
Recall the periodic trend that electronegativity generally changes as you move across a period (row) in the periodic table from left to right.
Recognize that as you move from left to right across a period, the number of protons in the nucleus increases, which increases the nuclear charge.
Because the nuclear charge increases while the shielding effect remains relatively constant across a period, the effective nuclear attraction on the valence electrons increases.
Conclude that this increased attraction causes electronegativity to increase from left to right across a period.
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