Which of the following correctly lists the five atoms in order of increasing size (smallest to largest)?

Which of the following correctly lists the five atoms in order of increasing size (smallest to largest)? 



A) O < F < S < Mg < Ba
B) F < O < S < Mg < Ba
C) F < O < S < Ba < Mg
D) O < F < S < Ba < Mg
E) F < S < O < Mg < Ba


Answer: C


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