Multiple Choice
Which of the following transition metals would be expected to have the smallest atomic radius?
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10. Periodic Properties of the Elements
Periodic Trend: Atomic Radius
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Which of the following best describes the trend in atomic radius across a period from left to right on the periodic table?
A
Atomic radius first increases, then decreases across a period.
B
Atomic radius remains constant across a period.
C
Atomic radius increases from left to right across a period.
D
Atomic radius decreases from left to right across a period.
Verified step by step guidance1
Understand that atomic radius refers to the size of an atom, typically measured as the distance from the nucleus to the outermost electron cloud.
Recall that across a period (left to right) on the periodic table, the number of protons in the nucleus increases, which increases the nuclear charge.
Recognize that as nuclear charge increases, electrons are pulled closer to the nucleus because the effective nuclear charge felt by the electrons increases.
Note that although electrons are added across the period, they enter the same principal energy level, so shielding does not increase significantly to offset the increased nuclear charge.
Conclude that due to the stronger pull from the nucleus and relatively constant shielding, the atomic radius decreases from left to right across a period.
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