What is the least abundant element on the earth's atmosphere?

elburcher

The order of elements in the atmosphere is nitrogen (78.1%), oxygen (20.9%), argon (0.96%), followed by (in uncertain order) carbon and hydrogen. The carbon and hydrogen concentrations are variable for a number of reasons, including human activity. Sulfur, phosphorus, and all other elements are present in significantly lower proportions. According to the above graphic, argon, a significant if not major component of the atmosphere, does not appear in the crust at all. http://en.wikipedia.org/wiki/Abundance_of_the_chemical_elements#Atmosphere Aug 04 06, 11:01 PM

What-A-Mess

Whatever is artificially introduced by man would be the least. Aug 05 06, 5:11 AM

davejacobs

Difficult to answer this; all those that do not occur at all I suppose, like iron, uranium, gold, etc. Aug 05 06, 7:43 AM

Krisburs

A difficult question to answer because there are a lot of "trace elements" in the atmosphere, which without our help would not normally be there. Francium is the least abundant element on earth because it is the most unstable. It has a half-life of 22 minutes and estimates suggest that only one atom of naturally occurring Francium exsists on the Earth at any one time. If this were to get into the atmosphere, theres the answer! Aug 05 06, 10:11 AM

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What is the most abundant element in nature? After oxygen, what is the most abundant element in the Earth's crust? What is the most abundant mineral on earth? What are the predominant gases in the moon's atmosphere?

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