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Argon, Ar, has the atomic number of 18 on the Periodic Table of Elements.

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13y ago
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14y ago

No stable isotope of an element has mass no 18, although unstable isotopes of fluorine and oxygen have mass no 18, 8O18 and 9F18

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12y ago

Argon! Noble Gas!

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9y ago

Atomic number 18 is Argon (Ar).

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Q: What is the 18 element in the periodic table?
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