What is the different number between fluorine and argon

Compare Fluorine and Argon on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Fluorine vs Argon with most reliable information about their properties, attributes, facts, uses etc. You can compare F vs Ar on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electron affinity, physical states, electrical conductivity and many more  fluorine is the number 9 and argon is the number 18

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the answer is letter c : ) hope this