Argon, atomic number 18, has an atomic weight of 39.9. Potassium, atomic number 19, has an atomic weight of 39.1. Which of these statements best explains why potassium has a lower atomic weight than argon?
A.
Potassium is reactive, while argon is typically inert.
B.
Potassium atoms lose electrons more easily than argon atoms.
C.
Potassium is typically a solid, while argon is typically a gas.
D.
Potassium atoms usually have fewer neutrons than argon atoms.
Answers: 3
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