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Periodic Trends and Coulombic Attraction
Worksheet
Grade Level
Chemistry
11.20 Periodic Trends and Coulombic Attraction
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A student says, 'K is larger than Na because K has fewer protons pulling on its electrons.' What is the best correction?
A
The student is correct because potassium has fewer protons than sodium.
B
K is larger because its valence electron is in n = 4 with more shielding and distance; K actually has more protons than Na.
C
K is larger only because it has fewer electrons than Na.
D
K and Na are the same size because both are group 1 atoms.
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