June 2017 NY Regents Chemistry Exam
13 Compared to a potassium atom, a potassium ion has (1) a smaller radius
(2) a larger radius (3) fewer protons
(4) more protons
Solution: If we find potassium (K) on the Periodic Table, we will see a charge of +1. This means when potassium atom becomes an ion, it loses one electron. Losing an electron means the radius gets smaller.
Answer: 1
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