Why Was Argon Absent from Mendeleev's Original Periodic Table of 1871

question 189

Multiple Choice

Why was argon absent from Mendeleev's original periodic table of 1871?

• A)Argon is unstable.
• B)Argon is radioactive.
• C)Argon had not been discovered.
• D)Argon occurs only in compounds.
• E)none of the above

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